an act or course of action to which a person is morally or legally bound; a duty or commitment
(道义,法律上的)义务(或责任);承诺
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[with infinitive]
I have an obligation to look after her .我有义务照顾她。
[mass noun]the condition of being morally or legally bound to do something
(道义,法律上必须做某事的)约束
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they are under no obligation to stick to the scheme .他们不受必须恪守该方案的任何约束。
a debt of gratitude for a service or favour
恩惠,人情债
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she didn't want to be under an obligation to him .她不想欠他的情。
【律】(承诺付款等的)合同,契约。
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day of obligation (in the Roman Catholic Church) a day on which all are required to attend Mass (罗马天主教)所有的人都必须参加弥撒的日子
"Middle English (in the sense ‘formal promise’): via Old French from Latin