commutable
(a.)可取代的
Com·mut·a·ble a. Capable of being commuted or interchanged.
The predicate and subject are not commutable. --Whately.
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commutable
adj 1: subject to alteration or change; "the death sentence was
commutable to life imprisonment" [ant: incommutable]
2: capable of being exchanged for another or for something else
that is equivalent [syn: substitutable]