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1·We mustn't speak loudly.

我们不能大声说话。

2·It's impolite to speak loudly in public.

在公共场合大声说话是不礼貌的。

3·It is impolite to speak loudly in public.

在公共场合大声说话是不礼貌的。

4·We should keep quiet in the cinema. We mustn't speak loudly.

我们在电影院应该保持安静。我们不能大声说话。

5·It's impolite for each of us to speak loudly in public places.

对我们每个人来说，在公共场所大声说话都是不礼貌的。

6·Mr. Wang, please speak loudly in the hall to make yourself understood while others are there.

王先生，其他人都在场时，请在大厅里大声说话，以便别人听得懂。

7·Speak loudly. When you are not confident, you can't do well what you want to do.

大声说出来。当你不自信的时候，你不能做好你想做的事情。

8·I can speak loudly and clearly while answering questions.

我可以在回答问题时大声而清晰地说话。

9·We are not allowed to speak loudly in public.

我们不允许在公共场合大声喧哗。

10·In order to make people hear you clearly, you should speak loudly.

为了让人们听得清楚，你说话应该大声点。