| 单词 | vector |
| 释义 | vector (once / 18942 pages) 1n 2n One definition of a vector is that of a carrier — it might be an insect like a mosquito that carries and transmits a bacterium or virus, or it might be some agent that carries genetically engineered DNA into a cell. Considering that the Latin word vector comes from the word vehere, which means "to carry," it's not surprising that the current use of the word also "carries" the same meaning. In fact, in computers, a vector is a method used to propagate a computer virus. However, the word vector is also used in various scientific areas, including mathematics, where it indicates something possessing both size and direction; and aeronautics, where it indicates a projectile's course. WORD FAMILYvector: vectors USAGE EXAMPLESThey destroy gardens and are vectors for disease. Slate(Dec 16, 2016) Just before going silent the pilot made a final plea to land: “Vectors, señorita. Landing vectors.” The Guardian(Nov 30, 2016) He says the Kodiak complex is still working with Vector and that he’s confident a launch will happen at the facility later in 2017. Washington Times(Nov 30, 2016) 1 1n a straight line segment whose length is magnitude and whose orientation in space is direction Hypo|Hyper ray (mathematics) a straight line extending from a point straight line a line traced by a point traveling in a constant direction; a line of zero curvature 2n any agent (person or animal or microorganism) that carries and transmits a disease mosquitos are vectors of malaria and yellow fever fleas are vectors of the plague when medical scientists talk about vectors they are usually talking about insects Syn|Exp|Hypo|Hyper transmitter Typhoid Mary United States cook who was an immune carrier of typhoid fever and who infected dozens of people (1870-1938) gene delivery vector, transducing vector a vector for delivering genes into cells carrier, immune carrier(medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others liposomal delivery vectora transducing vector that uses liposomes to carry the gene of interest viral delivery vectora transducing vector that uses a retrovirus agent an active and efficient cause; capable of producing a certain effect 3n (genetics) a virus or other agent that is used to deliver DNA to a cell 2Hypo|Hyper cosmid (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments virus (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein n a variable quantity that can be resolved into components Hypo|Hyper cross product, vector product a vector that is the product of two other vectors resultant, vector suma vector that is the sum of two or more other vectors radius vectora line connecting a point in space to the origin of a polar coordinate system radius vectora line connecting a satellite to the center of the body around which it is rotating variable, variable quantity a quantity that can assume any of a set of values |
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