词汇 | permutation |
释义 | permutation /ˏpɝmjә`teʃәn/ n. The exchange of one thing for another. 交换;互易。 Any of the ways in which a number of objects. Letters, etc., maybe arranged. 【数】排列。 The letters a, b, c, taken tow at a time, have six permutations; ab, ac, ac, bc, ca, cb. 将 a、 b、c 三字每二个放在一起,则有六种排列方式:ab、 ac、ac、bc、ca、cb。 |
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