People are trying to make the once polluted river clean again
问题描述:
People are trying to make the once polluted river clean again
答
人们正试图使曾被污染的河流再次变得干净。
答
人们在努力将被污染的河水变干净。
答
人们正在尽全力把曾经被污染的河再次清理干净