| 单词 | atom |
| 释义 | atom (once / 315 pages) n An atom is the basic unit of an element. When you see the chemical formula for water, H2O, it's telling you that each molecule of water is made up of two atoms of hydrogen and one atom of oxygen. In science class, you've probably come across atoms, the bits that make up molecules. Less scientifically, the word atom can also mean a very small piece of anything at all. The Greek root of atom is atomos, which means "indivisible," since the scientists who first gave the atom its name imagined it couldn't be split or divided into smaller pieces. Even though we know there are smaller things that make up an atom (protons, neutrons and electrons), it's still a good way to think about the word atom. WORD FAMILYatom: atomic, atomise, atomism, atomize, atoms+/atomic: atomically, subatomic/atomise: atomisation, atomised, atomiser, atomising/atomism: atomistic/atomistic: atomistical, atomistically/atomize: atomization, atomized, atomizer, atomizes, atomizing/atomizer: atomizers USAGE EXAMPLESHaber discovered that was necessary as a catalyst to break the bonds between air's nitrogen atoms and persuade them to bond with hydrogen instead. BBC(Jan 01, 2017) But there is no guarantee that Wimps – if they exist – will ever interact with atoms of normal matter. The Guardian(Dec 31, 2016) More constant than the earth’s rotation are atomic clocks, which measure the regular and super-precise vibration of cesium atoms. Time(Dec 30, 2016) 1n (physics and chemistry) the smallest component of an element having the chemical properties of the element Hypo|Hyper isotope one of two or more atoms with the same atomic number but with different numbers of neutrons monad(chemistry) an atom having a valence of one carbon atoman atom of carbon hydrogen atoman atom of hydrogen free radical, radicalan atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule radioisotopea radioactive isotope of an element; produced either naturally or artificially acid hydrogen, acidic hydrogena hydrogen atom in an acid that forms a positive ion when the acid dissociates deuterium, heavy hydrogenan isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) substance the real physical matter of which a person or thing consists 2n (nontechnical usage) a tiny piece of anything Syn|Hypo|Hyper corpuscle, molecule, mote, particle, speck grain a relatively small granular particle of a substance grindingmaterial resulting from the process of grinding chylomicrona microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood flyspecka tiny dark speck made by the excrement of a fly identification particlea tiny particle of material that can be added to a product to indicate the source of manufacture granulea tiny grain Microtaggant(trademark) a microscopic and traceable identification particle used to trace explosives or other hazardous materials or to prevent counterfeiting material, stuff the tangible substance that goes into the makeup of a physical object |
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