What you can do, just once, is to make a polite request for another to stop the behavior that you find frustrating, annoying or disturbing.

我们所能做的只是礼貌地请对方不要再做出我们认为会使我们泄气、厌烦或者不安的行为。

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However, it's more polite than a direct request.

但是，比起直接的询问，这是一种更为礼貌的请求。

Would you please 课堂 - SpeakingMax英语口语达人

Best of all, asking the public to sponsor a valve is far more interesting than a polite request for donations.

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But our request to film there has been met with a polite refusal on the grounds of commercial confidentiality.

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