incumbent

柯林斯词典

1. N-COUNT An incumbent is someone who holds an official post at a particular time. 在职者[正式]
In general, incumbents have a 94 percent chance of being re-elected. 一般情况下，现任官员有94%的几率会再次当选。
2. ADJ Incumbent is also an adjective. 在职的[ADJ n]
...the only candidate who defeated an incumbent senator. …惟一击败了现任参议员的候选人。
3. ADJ If it is incumbent on or upon you to do something, it is your duty or responsibility to do it. 有责任履行的[正式]
She felt it was incumbent on herself to act immediately. 她感到立即采取行动是她义不容辞的责任。