n. 排列组合

permutation and combination的用法和样例：

例句

用作名词(n.)

Unique because that particular permutation has not appeared before.之所以独一无二，是因为那种独特的基因排列组合以前不曾出现过。
Besides, the author understood the rule of negative multiplication completely and studied the problem of permutation and combination deeply.另外，萨玛瓦尔完全理解了负数的乘法法则，并对排列组合问题也有充分的认识。

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