When chemical plants first developed, safety and the environment were not usually greatly considered, resulting in air and water pollution, and poor safety practice.
化工厂刚刚出现的时候，对安全和环境问题一般都没有给予足够的重视，因此造成了空气污染、水污染和不安全运作等问题。
Non-point source pollution is one of major reasons resulting in bad quality of water, so human has paid great attention to it.
非点源污染作为引起水质恶化的主要原因之一，已越来越受到人们的重视。
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