able to be replaced or done without; superfluous
可替代的;可有可无的;多余的
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the captain's loss of form made him dispensable .船长失落的状态使他成了累赘。
(of a law or other rule)able to be relaxed in special cases
(法律或其他规则)在特定情况下可放宽的,可通融的。
"early 16th cent. (in the sense ‘permissible in special circumstances’): from medieval Latin