一级行政区
- 网络province;States and territories
一级行政区-
一级行政区的沿海低地人口大都随时间变化不断增加。
People lived in coastal lowlands increased with time change .
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上海以南，除台湾和海南，其余一级行政区沿海低地洪水高发生频率区的人口比重很大，甚至接近或达到100%。
In the coastal lowlands from the south of Shanghai , except for Taiwan and Hainan , the proportion of the population in the high-frequency areas of tropical cyclones were greater , which in some regions approached or reached 100 % .