形容詞 commutable:

1. subject to alteration or change
2. capable of being exchanged for another or for something else that is equivalent
   同義詞：substitutable

1. A commutable prison sentence.
   可減刑的監(jiān)獄判決
2. A pension is often commutable into a lump sum.
   養(yǎng)老金常可改為一次性總付款。

com.mut.a.ble

adj.（形容詞）
That can be substituted, interchanged, or revoked:
可代替的，可取消的，可減刑的：能夠替代、交換或取消的：
例句：
a commutable prison sentence.
可減刑的監(jiān)獄判決

Accessible to commuters:
可到達的定期短途航線的：
例句：
.Seattle`s next most commutable island is Vashon.(Islands)
.西雅圖的下一個最可能的定期短途航線的島嶼是瓦申.(島嶼)

【引伸】
commut.abil.ity
n.（名詞）