Question

incumbent 【incumbent】adj.负有义务的It is incumbent on you to give a father's advice before your son leaves home.在儿子离家前给他一点忠告，是作父亲的你应尽的义务。

Accepted Answer

[ɪn'kʌmbənt] 
incumbentnecessary (for someone) as a duty or responsibility; morally binding
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 comes from the Latin word incumbens, which means lying in or leaning on, but came to mean holding a position. It was first used in English for someone holding a church office, and then someone holding any office. You'll most likely hear it today for political officials. In a race for mayor, the incumbent mayor faces a challenger. Incumbent also means obligation. It is incumbent upon you to do the dishes.
All forms of 'incumbent' will appear on average once every 913 pages.incumbencyincumbentsuperincumbent

Front	incumbent
Pron	[ɪn'kʌmbənt]
Back	【incumbent】 adj.负有义务的 It is incumbent on you to give a father's advice before your son leaves home. 在儿子离家前给他一点忠告，是作父亲的你应尽的义务。
Vocab	incumbentnecessary (for someone) as a duty or responsibility; morally binding 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 comes from the Latin word incumbens, which means lying in or leaning on, but came to mean holding a position. It was first used in English for someone holding a church office, and then someone holding any office. You'll most likely hear it today for political officials. In a race for mayor, the incumbent mayor faces a challenger. Incumbent also means obligation. It is incumbent upon you to do the dishes. All forms of 'incumbent' will appear on average once every 913 pages. incumbency incumbent superincumbent

Incumbent Holding Office Means ɪn'kʌmbənt Adj.负有义务的 Give Father's