资料来源 : pyDict

能交换的,可排列的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Permutable \Per*mut"a*ble\, a. [Cf. F. permutable.]
   Capable of being permuted; exchangeable. --
   {Per*mut"a*ble*ness}, n. -- {Per*mut"a*bly}, adv.

资料来源 : WordNet®

permutable
     adj :  capable of changing sequence [syn: {transposable}]