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1·Wear a mask when going out and wash hands with soap.

外出时戴上口罩，用肥皂洗手。

2·Everyone must wear a mask. Go and buy one if you don't have one.

每个人都必须戴口罩。如果你没有，就去买一个。

3·If you don't wear a mask, you will not be allowed to get on the bus.

如果你不戴口罩，就不能上车。

4·Why? Does he wear a mask?

为什么？他戴着面具？

5·Why not wear a mask as a precaution?

为什么不带个口罩，以防万一？

6·You don't have to wear a mask, do you?

你不需要戴面具，对吗？

7·You do not wear a mask?

你还不戴面具？

8·You feel like you have to wear a mask.

你觉得必须掩饰自己。

9·Each motorcycle driver has to wear a mask.

每个摩托车驾驶员都得戴面罩。

10·Everybody had to wear a mask at the party.

化妆晚会上每个人都要戴面具。