In recent years, China's water pollution problem has become a cross-regional, inter-basin complex problem.

近年来，我国水污染问题已经成为了跨区域，跨流域的复杂问题。

youdao

In recent years, China's water pollution problem has become a cross-regional, inter-basin complex problem.

近年来，我国水污染问题已经成为了跨区域，跨流域的复杂问题。

youdao