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a (letter in) reply to a friend的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
名詞 a:
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a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
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any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
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one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
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(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
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the basic unit of electric current adopted under the Systeme International d'Unites
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the 1st letter of the Roman alphabet
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the blood group whose red cells carry the A antigen
