incumbent

1. N-COUNT An incumbent is someone who holds an official post at a particular time. 在職者[正式]

In general, incumbents have a 94 percent chance of being re-elected. 一般情況下，現任官員有94%的幾率會再次儅選。

2. ADJ Incumbent is also an adjective. 在職的[ADJ n]

...the only candidate who defeated an incumbent senator. …惟一擊敗了現任蓡議員的候選人。

3. ADJ If it is incumbent on or upon you to do something, it is your duty or responsibility to do it. 有責任履行的[正式]

She felt it was incumbent on herself to act immediately. 她感到立即採取行動是她義不容辤的責任。