英语词汇“activate”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

VERB TABLE

activate

Simple Form
Present	I, you, we, they	activate
	he, she, it	activates
Past	I, you, he, she, it, we, they	activated
Present perfect	I, you, we, they	have activated
	he, she, it	has activated
Past perfect	I, you, he, she, it, we, they	had activated
Future	I, you, he, she, it, we, they	will activate
Future perfect	I, you, he, she, it, we, they	will have activated

Continuous Form
Present	I	am activating
	he, she, it	is activating
	you, we, they	are activating
Past	I, he, she, it	was activating
	you, we, they	were activating
Present perfect	I, you, we, they	have been activating
	he, she, it	has been activating
Past perfect	I, you, he, she, it, we, they	had been activating
Future	I, you, he, she, it, we, they	will be activating
Future perfect	I, you, he, she, it, we, they	will have been activating

EXAMPLES FROM OTHER DICTIONARIES

In certain rare circumstances, these vaccines could activate disease.
The bomb's firing mechanism is activated by a time-clock.
The manufacture of chlorophyll in plants is activated by sunlight.
The process is activated by sunlight.
The smoke activated the sprinkler system.

EXAMPLES FROM THE CORPUS

Baking powder contains its own built-in acid, so it can be activated with just heat and liquid.
Melanin producing cells in our bodies are activated by ultraviolet light from the sun and can have a protective effect.
Room keys activate the temperature controls and turn on an entry light, so guests never enter a dark room.
The different ways in which superantigens activate T cells casts light on the pathogenesis of infectious disease.
The stun gun was applied to parts of her naked body and activated, the jury was told.
Then, their ears protected against the piercing whine, they activated the suction pump.
To be completely safe, he activated his automatic call-signal which would be picked up on the ground.

Longman Language Activatorwhen something starts a natural process► start

· Investigators still aren't sure what started the fire.· It is thought that the avalanche was started by a small rock-fall on the higher slopes.· Adding acid to the test tube starts a chemical process which leads to the formation of crystals.

► activate

to start a natural process, especially one that will continue for a fairly long time - used especially in scientific contexts : · The process is activated by sunlight.· In certain rare circumstances, these vaccines could activate disease.

► set off

to start a natural process, usually accidentally and with the result that it is difficult to stop it: · In 1992, tidal waves set off by a strong earthquake killed around 2000 people.· The splitting of an atom sets off an explosive chain reaction.

to switch something on► switch on

to make something start working, for example by pressing a button - use this about things that use electricity, for example lights, televisions, or computers: switch on something: · Will you switch on the television?· I switched on the radio to listen to the news.switch something on: · Do you mind if I switch the light on?· Exhaust fumes come into the car when I switch on the air conditioner.

► turn on

to make something start working, for example by turning a tap or pressing a button - use this about things that use electricity, gas, or water: turn on something: · He went into the bathroom and turned on the shower.· Use timers to turn on indoor lights while you are away.turn something on: · Do you want me to turn the lights on?

► put on

to make a light, radio etc start working: put the light/radio/TV/kettle etc on: · Eva put the kettle on to make a cup of coffee.· Put the light on, then we can see what we're doing.· It was so cold I put the heating back on.

► start

also start up to make a car, engine, machine etc start working: · She started the car and backed slowly out of the garage.· Clean or replace the air filter before attempting to start the engine.

► get something started/going

: get a car/engine/machine etc started/going to succeed in making a car etc start after having some difficulty: · I couldn't get my car started this morning.· He rebuilt the engine and finally got it going.· It took the repairman an hour to get the washing machine going again.

► set off

to do something to make a piece of equipment that warns you about something start: set off something: · Someone accidentally set off the fire alarm.· Smoke alarms can be set off by smoke from cigarettes, cooking, and fireplaces.set something off: · The alarm is so sensitive that the slightest movement will set it off.

► activate

to make a system start operating - use this especially in technical contexts: · The bomb's firing mechanism is activated by a time-clock.· The smoke activated the sprinkler system.

► set something going

to make a clock, toy, or other machine that does not have a power supply start moving: · Mr Carey wound up the old clock and gently set the pendulum going.· She pulled the lever that set the pump going and waited for the water.

► push/press a button

to press a button which makes a machine start: · What happens when you press this button?· Somebody pushed the alarm button.

► throw a switch

to pull a large control that switches on the electricity supply to something: · The Speaker of the House threw the switch for the Christmas tree lights in front of the Capitol building.

COLLOCATIONS FROM OTHER ENTRIES► set off/trigger/activate the alarm

(=make it start ringing)· A window blew open, setting off the alarm.

COLLOCATIONS FROM THE CORPUSADVERB► also

· Less reciprocal discourse will also activate schemata.· The away mode, as it adjusts the lights and temperature, also activates the security system.· But we can also activate the cytoplast at the same time as the donor nucleus is introduced.

► only

· The other option is to have it resident at all times but is activated only when you want a fax converting.· The beam needs to activate only two of the five cells on the staff.· The input cells are activated only by sensory input.

NOUN► cell

· The possibility that intestinal epithelial cells may produce platelet activating factor has been suggested by Kald etal.· A Pessarane Behesht sleeper cell has been activated in London to assist you.· So you can effect cell fusion without activating the oocytes if you do this in a calcium-free medium.· Both cell types generated platelet activating factor activity and this was generally comparable for epithelial and lamina propria cells.· It was not easy, however, to show whether, and to what extent, these cells were activated.· The input cells are activated only by sensory input.

► gene

· Certainly both groups find that p53 levels rise following radiation, and this could specifically activate transcription of apoptosis-inducing genes.· Its special property is that it can activate most of the genes that are required in the mature muscle.

► platelet

· The content of platelet activating factor in pancreatic tissue was determined using bioassay technique with washed rabbit platelets as described previously.· The significance of platelet activating factor in the gastric juice of healthy humans is still difficult to analyse.· About 24 hours before assay the sample was placed in 80% ethanol to extract platelet activating factor from the tissue.· These results suggest the involvement of platelet activating factor in the endothelin induced fibrinolytic activation and subsequently developed mucosal haemorrhagic lesion.· These results indicate that platelet activating factor may be an important factor in the progression of acute pancreatitis provoked by caerulein.· The level of platelet activating factor in the rat gastric mucosa was determined after the administration of endothelin-1 using a radioimmunoassay method.· Lyso platelet activating factor and alkyl acyl glycerophosphocholine were not significantly higher in Crohn's disease than in controls.· The role of platelet activating factor blocker in the treatment of inflammatory bowel disease deserves investigation.

► system

· For example, edges tend to activate the visual system more than areas of uniform brightness.· When you try to activate these systems yourself, the body becomes aroused, which pushes sedation and ultimately sleep further away.· It activated an automatic safety system, sending control rods down into the core of the plant.· The away mode, as it adjusts the lights and temperature, also activates the security system.