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She is under an obligation to her adoptive mother.
她有义务赡养她的养母。
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Every player is under an obligation to keep the rules.
每个选手都必须遵守这些规则。
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The court laid the young thief under an obligation to report to the police station once a week.
法院强迫那个小偷每周向警察局报到一次。
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Their frequent invitation places us under an obligation to invite them to our house for a change.
他们经常邀请我们, 我们只好礼尚往来邀请他们到我们家。