per·mu·ta·tion /ˌpɝmjʊˈteʃən/
 交換,排列


 permutation
 排列;置換


 permutation
 排列 置換


 Per·mu·ta·tion n.
 1. The act of permuting; exchange of the thing for another; mutual transference; interchange.
    The violent convulsions and permutations that have been made in property.   --Burke.
 2. Math. (a) The arrangement of any determinate number of things, as units, objects, letters, etc., in all possible orders, one after the other; -- called also alternation.  Cf. Combination, n., 4. (b) Any one of such possible arrangements.
 3. Law Barter; exchange.
 Permutation lock, a lock in which the parts can be transposed or shifted, so as to require different arrangements of the tumblers on different occasions of unlocking.

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 permutation
      n 1: an event in which one thing is substituted for another; "the
           replacement of lost blood by a transfusion of donor
           blood" [syn: substitution, transposition, replacement,
            switch]
      2: the act of changing the arrangement of a given number of
         elements
      3: complete change in character or condition; "the
         permutations...taking place in the physical world"- Henry
         Miller
      4: act of changing the lineal order of objects in a group