Were every one to sweep before his own house, every street would be clean.
如果每个人都打扫自己的房子，每条街都会很干净。
Were every one to sweep before his own house, every street would be clean.
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Were every one to sweep before his own house, every street would be clean.
如果每个人都打扫自己的房子，每条街都会很干净。
