An underground power station is a type of constructed by excavating the major components (e.g. machine hall, penstocks, and tailrace) from rock, rather than the more common surface-based construction methods. One or more conditions impact whether a power station is constructed underg.
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Hainan Free Trade Port is a free trade port in , China. As an offshore island, Hainan is also the largest special economic zone in the (PRC). It is regarded as a special area for China to comprehensively deepen economic reform and experiment with the highest level of opening-up policies. Hainan Free Trade Port is not a in the usual sense, as the entire.
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