M: The air is too dirty, especially in the streets. 空气太脏了，特别是在街上。
W: I have the same feeling. 我有同样的感觉。
M: Everyday when I wash my face, I find the water turns black.
每天我洗脸的时候，我发现水变黑了。
W: But I don't like wearing a mask, and it's not the effective way to solve the problem.
但是我不喜欢带 面罩，况且这不是解决问题的有效途径。
M: I know. But what can we do? We have to go to school by bike.
我知道。但是我们能做什么呢？我们不得不骑车去上学。
