141在房间角落里啼哭的姑娘，曾经是我校最优秀的学生之一，但她这次考试却失败了。
The girl crying in the corner of the room had been one of the best students in our school, but this time she failed in the exam.
142使河流变清不是件容易的事，但我们的政府已经下定决心要清除污染。(mind, river)
It is not easy to make the river clean again, but our government has made up its mind to get rid of the pollution completely.
