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permutation/
ˌpɜːrmjʊˈteɪʃən
/
1.noun[u]
替换，交替，变更（指发生变换这一事实）
2.noun[u]
更换，更改，改变（指行为）
3.noun[c]
排列，序列，组合
4.noun[u] [Mathematics]
重排，重组