| 单词 | incumbent |
| 例句 | incumbent adjective 1.•it is incumbent on you to tell them:necessary for one to, essential that, required that, imperative that | compulsory for one to, binding on one to, mandatory that. 2.•the incumbent president:current, present, in office, in power | reigning.▶noun •the first incumbent of the post:holder, bearer, occupant. |
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