当开采宽度达到地表移动起动距时，地表下沉缓慢增长；

When the mining width reaches to the mining subsidence starting distance, the mining subsidence will grow slowly.

youdao

当开采宽度达到地表移动起动距时，地表下沉缓慢增长；

When the mining width reaches to the mining subsidence starting distance, the mining subsidence will grow slowly.

youdao