It is incumbent upon us to do so.
这样做我们义不容辞的责任。
It is incumbent upon us to do so.
这样做我们义不容辞的责任。
It is incumbent on me to reclaim him.
劝他我义不容辞的义务。
It's incumbent on you to advise your son before he leaves home.
在你儿子离家前他忠告你义不容辞的事。
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