The Pollution Haven Hypothesis (PHH) states that as a result of increased regulation, multinationals shift their dirty production to countries with poor environmental standards.
污染避难所假说指出，由于各项法规的逐日增加，跨国企业将其污染型生产工厂转移到环境规制薄弱的国家。
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The restriction regulation against diesel engine noises pollution become more stringent all over the world as long as people's environmental consciousnesses are rising.