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

    1. Guy was greedy, amoral and dishonest.
      盖伊贪心、不讲道德、又不诚实。
    2. 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

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