不要期望任何一个老师会免费授课，不管你或你的孩子是多么的有天赋。

Don't expect any teacher to teach for free, no matter how talented you or your child might be.

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他们不放过任何一个可以恶作剧老师的机会。

They threw away no opportunity to do the master a mischief.

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常老师说：“不要在你的画里画任何一个人。”

Mr. Chang said, "Don't put any people in your painting."

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