obligation造句
Co-operation was more than just an attractive option, it was an
obligation.
合作不仅仅是诱人的选择，它也是一种责任。
When teachers assign homework, students usually feel an
obligation to do it.
当老师布置家庭作业的时候，学生们通常觉得做作业是分内之事。
You are under no
obligation to buy anything.
你不必非买什么东西不可。