1.China's mainland coastline measures approximately 18,000 km, with a flat topography , and many excellent docks and harbors, most of which are ice-free all year round.
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with a flat topography
地势平坦
以上为机器翻译结果，长、整句建议使用 人工翻译 。
With a flat topography, the District covers a land area of 351.6 square meters, with exploitable land space of 200 square meters.
区内地势平坦，全区陆域面积351.6平方千米，可用于工业和城市建设的土地面积达200平方千米以上；
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