a-
英 [eɪ] 美 [eɪ‑]

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

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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