a-

听听怎么读

英 [eɪ]

美 [eɪ‑]

是什么意思

pref.

非；不；无；没有

英英释义

a-[ ə ]

n.
- a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
  同义词：angstromangstrom unitA
- any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
  同义词：vitamin Aantiophthalmic factoraxerophtholA
- one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
  同义词：deoxyadenosine monophosphateA
- (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
  同义词：adenineA
- the basic unit of electric current adopted under the Systeme International d'Unites
  同义词：ampereampA
- the 1st letter of the Roman alphabet
  同义词：Aletter a
- the blood group whose red cells carry the A antigen
  同义词：Atype Agroup A

学习怎么用

双语例句

Guy was greedy, amoral and dishonest.
盖伊贪心、不讲道德、又不诚实。
Henry used to be totally apolitical,but I think he is now politically more aware.
基辛格过去完全不问政治，但是，我认为现在他政治上比较敏锐了。

权威例句

The CES-D Scale: A Self-Report Depression Scale for Research in the General Population
Very Deep Convolutional Networks for Large-Scale Image Recognition
A decision-theoretic generalization of on-line learning and an application to boosting
Prevention of coronary and stroke events with atorvastatin in hypertensive patients who have average or lower-than-average cholester...
Refinement of Macromolecular Structures by the Maximum-Likelihood Method
Profiling of complex microbial populations by denaturing gradient gel electrophoresis analysis of polymerase chain reaction-amplifie...
32 – Rapid and Efficient Site-Specific Mutagenesis without Phenotypic Selection
Fronts propagating with curvature-dependent speed: algorithms based on Hamilton-Jacobi formulations
Measurement of Protein Using Bicinchoninic Acid,Anal. Biochem. 150, 76-85
Collaborative meta-analysis of randomised trials of antiplatelet therapy for prevention of death, myocardial infarction, and stroke ...