The annual collapsed coal mining area in China is about 20,000 hectares. The ecological environment of the mining area has been destroyed a lot.
我国每年采煤塌陷土地约为2万公顷，严重破坏了矿区的生态环境。
The annual collapsed coal mining area in China is about 20,000 hectares. The ecological environment of the mining area has been destroyed a lot.
我国每年采煤塌陷土地约为2万公顷，严重破坏了矿区的生态环境。
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