1. 方便：expediate 使加速 | expedience 方便 | expediency 私利

2. 权宜之计：extricat 松开 | expedience 权宜之计 | expedite 加速,速办,发送

3. 便利：expected vlaue 期望值 | expedience 便利 | expedient 便利的

4. 便利,权宜之计：expectation 期待;估计寿命 | expedience 便利,权宜之计 | expedient 有利的

noun

1. taking advantage of opportunities without regard for the consequences for others

Synonym: opportunismself-interestself-seeking

2. the quality of being suited to the end in view

Synonym: expediency