大气污染往往是跨区域的。
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。
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。
In recent years, China's water pollution problem has become a cross-regional, inter-basin complex problem.
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