a way, especially one of several possible variations, in which a set or number of things can be ordered or arranged
变化组合
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his thoughts raced ahead to fifty different permutations of what he must do .就必须要做的事他很快想出了50种不同的变化组合。
[mass noun]
【数】 排列;置换。
〈英〉 (足球普尔中特定比赛场次的)挑选。
"late Middle English (in the sense ‘exchange, barter’): via Old French from Latin