Individual demand for regional higher vocational education is a complex system.
区域高等职业教育个人需求是一个复杂的综合系统。
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.
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。
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