It's rude to listen in on other people's telephone calls.

偷听别人的电话是不礼貌的.

《简明英汉词典》

How dare you pick up the phone and listen in on my conversations!

你竟敢拿起电话偷听我的谈话！

柯林斯例句

Jeffrey was allowed to listen in on the committee's debate.

杰夫里被允许旁听委员会的讨论.

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How dare you two listen in on my telephone conversation!

你们两个竟敢偷听我打电话!

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To use electronic listening devices to listen in on the conversations of others.

使用电子收听装置来偷听他人的谈话.

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