你必须安静。
你必须安静地坐着上课；如果你再站起来，我就把你绑在椅子上。
You must sit quiet at your lessons; if you get up again I shall tie you to your chair.
要成为一名好作家，我想你必须找到一处你能思考的安静环境，最好是一处通达有限的地方。
To be a good writer, I think you must find a quiet environment where you can think, preferably one with limited accessibility.
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