You are under no obligation to buy anything.

你不必非买什么东西不可。

《牛津高阶英汉双解词典》

Ministers are under no obligation to follow the committee's recommendations.

部长不必非得听从委员会的建议。

辞典例句

Philosophy is under no obligation to furnish ready and handy answers.

而不是提供现成的答案.

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If you do not like them, you will be under no obligation whatever.

如不满意, 也没关系.

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