名词 n. 
1.(道义上或法律上的)义务;责任[C][U][(+to)][+to-v]
We were under obligation to finish the work in a satisfactory way. 
我们有义务圆满地完成工作。 
You are under no obligation to buy the house if you have not signed a purchase agreement. 
如果你没有签订购买合同,就不一定非买这房子不可。 
Our parents fulfilled their obligation to support us. 
父母亲尽到了抚养我们的责任。2.恩惠[C][(+to/toward)]
repay an obligation 
报答恩惠3.合约,契约;证券[C]
The builder failed to fulfil the terms of his obligation. 
营造商未能履行合同的条款。4.偿付债务的款项[C]
The lawyer drew up a legal paper discharging him from all obligations. 
律师拟定了一份法律文件,免除他所有的债务款项。