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单词解释

a  [ei,ə]      复制词条
art. [非特指的]一[个],每一,同一,第一,字母A, A字形

常用短语

  1. beat a retreat
    鸣金收兵,打退堂鼓,撤退,放弃
  2. a great deal
    很多,大量,…得多
  3. a bit
    一点儿,有点,些许.
  4. have a ball
    v. 狂欢
  5. a couple of
    一对,一双,两三个
  6.  展开显示全部常用短语 ...  

与 a 相关的例句

  1. A rude,insensitive person;a boor.
    乡下人粗鲁的、迟钝的人;乡下佬
  2. a patriarchal social system.
    父权制社会制度
  3. The Congress passed a new bankruptcy law.
    国会通过了一项新的破产法。
  4. The magazine exposed the politician as a crook.
    那份杂志揭穿了该政客是个行骗的老手。
  5. To trap or ensnare,as by a stratagem.
    诱捕设计使落入陷井或使入圈套
  6.  展开显示全部例句 ...  

英英解释

7个名词解释

  1. 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] a , angstrom , angstrom unit
  2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
    [同] a , antiophthalmic factor , axerophthol , vitamin a
  3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
    [同] a , deoxyadenosine monophosphate
  4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
    [同] a , adenine
  5. the basic unit of electric current adopted under the Systeme International d'Unites
    [同] a , amp , ampere
    [例]
    • a typical household circuit carries 15 to 50 amps
  6. the 1st letter of the Roman alphabet
    [同] a , letter a
  7. the blood group whose red cells carry the A antigen
    [同] a , group a , type a


 
 


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