他发现，水是从河里来的，而河水被伦敦排出的脏水污染了。

He found that it came from the river polluted by the dirty water from London.

youdao

他发现，水是从河里来的，而河水被伦敦排出的脏水污染了。

He found that it came from the river polluted by the dirty water from London.

youdao