a.

听听怎么读

是什么意思

abbr.

adjective 形容词；

英英释义

a.

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

用作冠词(art.)

There is a pen on the table.
桌子上有一支笔。
We have a problem.
我们有个问题。
I can only carry two at a time.
我一次只能带两个。
Let's go to a Chinese restaurant.
我们去一家中餐餐馆。
A cat is an animal.
猫是动物。

权威例句

A decision-theoretic generalization of on-line learning and an application to boosting
Marching cubes: A high resolution 3D surface construction algorithm
A population genetic software for exact test and ecumenicism: GENEPOP, version 3.4
Marching cubes: a high resolution 3D surface construction algorithm
A Gene-Expression Signature as a Predictor of Survival in Breast Cancer — NEJM
A new technique for the assay of infectivity of human adenovirus 5 DNA.
A Brief History of Neoliberalism
Statecharts: a visual formalism for complex systems
MOLMOL: a program for display and analysis of macromolecular structures.
Validation study of WOMAC: a health status instrument for measuring clinically important patient relevant outcomes to antirheumatic ...

a开头的单词