It is important that we should speak politely.

我们说话要有礼貌，这是很重要的。

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He also insists we should speak no Chinese in the classroom.

他还要求我们课堂上不能讲中文。

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Our English teacher insists that we should speak English in and out of class.

英语老师坚持要我们在课堂内外都讲英语。

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The law has said its word and we should not speak about it any more.

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And again, no one should be surprised that we speak out for and work for democracy around the world.

WHITEHOUSE: Press Briefing