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1·Ideally you should keep a tooth brush in your pocket and use it immediately after you have finished eating.

理想情况下，你应该在口袋里放一把牙刷，吃完后立即使用。

2·B: Yes, a tooth brush please.

对，还要一支牙刷。

3·I know tooth brush and tooth paste.

我知道牙刷和牙膏。

4·Do you need tooth brush?

你想刷牙吗？

5·Don't forget to pack your tooth brush!

别忘了把牙刷放到箱子里去！

6·Are you offering them a new improved tooth brush?

你是向他们推销一种改进型新牙刷吗？

7·I am aggrieved to find that someone has used my tooth brush.

我发现有人用过我的牙刷，我很不高兴。

8·This kind of tooth brush is eight cents cheaper than that kind.

这种牙刷比那种便宜八分钱。

9·The older your tooth brush is, the more bacteria it accumulates.

你的牙刷越旧，上面积聚的细菌越多。

10·Purchase a new tooth brush and learn to clean your mouth properly.

去买个新牙刷，学学如何正确刷牙。

(1)electric toothbrush电动牙刷