其他
每日N词 | incumbent-在职的;现任的;有责任 | 20170105
Dan felt it incumbent on him to pay for the window, since he had hit the ball that broke it.
Dan觉得自己有责任赔偿这块窗玻璃，因为是他踢球时打破的。
▷incumbent [ɪn'kʌmbənt]（adj.）
【释义】An incumbent is an official who holds an office. If you want to run for congress, you're going to have to beat the incumbent. Incumbent also means obligation. It is incumbent upon you to do the dishes.use the adjective imperative.
having the
现任的；在职的
The incumbent which many before he took .现任总统面临着他上任前很多年就已开始出现的种种问题。
▷be incumbent on/upon sb
to be for someone
（某人）义不容辞；（某人）必须履行
She it incumbent upon/on her to the at .她感到她有义务在他们的会上提出这个问题。
每日N词 | gratuitous-不必要的;无谓的 | 20170104
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