资料来源 : pyDict

减去,减法

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Subtraction \Sub*trac"tion\, n. [L. subtractio a drawing back.
   See {Subtract}, and cf. {Substraction}.]
   1. The act or operation of subtracting or taking away a part.

   2. (Math.) The taking of a lesser number or quantity from a
      greater of the same kind or denomination; an operation for
      finding the difference between two numbers or quantities.

   3. (Law) The withdrawing or withholding from a person of some
      right to which he is entitled by law.

   Note: Thus the subtraction of conjugal rights is when either
         the husband or wife withdraws from the other and lives
         separate without sufficient reason. The subtraction of
         a legacy is the withholding or detailing of it from the
         legatee by the executor. In like manner, the
         withholding of any service, rent, duty, or custom, is a
         subtraction, for which the law gives a remedy.
         --Blackstone.

资料来源 : WordNet®

subtraction
     n 1: an arithmetic operation in which the difference between two
          numbers is calculated; "the subtraction of three from
          four leaves one"; "four minus three equals one" [syn: {minus}]
     2: the act of subtracting (removing a part from the whole); "he
        complained about the subtraction of money from their
        paychecks" [syn: {deduction}] [ant: {addition}]