to read to the students--their own children, really.
共同为学生们, 其实就是他们自己的孩子, 朗读
The napkin is dirty, Would you bring me a clean one, please?
这餐厅是脏的,请你拿个干净的给我。
Yes, I see. How can they get rid of waste water in this way? What a terrible colour the sea is now! It looks as if our class won't be able to bathe at all.