obligation造句
Co-operation was more than just an attractive option, it was an
obligation.
合作不僅僅是誘人的選擇，它也是一種責任。
When teachers assign homework, students usually feel an
obligation to do it.
當老師布置家庭作業(yè)的時候，學生們通常覺得做作業(yè)是分內(nèi)之事。
You are under no
obligation to buy anything.
你不必非買什么東西不可。