incumbent
adjective uk/ɪnˈkʌm.bənt/ us/ɪnˈkʌm.bənt/
[ before noun ]现任的;在职的
officially having the named position
The incumbent president faces problems which began many years before he took office. 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 someone formal （某人）义不容辞；（某人）必须履行
to be necessary for someone
She felt it incumbent upon/on her to raise the subject at their meeting. 她感到她有义务在他们的会上提出这个问题。
It is incumbent on us all to speak out when we see injustice.
We believe it is incumbent upon scientists to do a better job of communicating with the public.
It is incumbent on the fuel industry to work cooperatively with the government.
It is incumbent on the board of directors to take swift action.
incumbent
noun [ C ] uk/ɪnˈkʌm.bənt/ us/ɪnˈkʌm.bənt/
现任者，在职者
the person who has or had a particular official position
the first/last/previous incumbent 第一任／上一任／前任
The present incumbent (of the post) is due to retire next month. （此职位的）现任者将于下个月退休。