Take an underground copper mine as studying object, on which the surface has to be protected, the mining method of sublevel filling method with roof reconstructing is studied.
以某地下铜矿为研究对象，研究了地表要求保护的前提下极破碎矿体的顶板再造上向分段充填采矿法。
It spreads primarily by underground stems; colonies form when pieces of the root system or whole plants float into an area and take root or when seeds float into a suitable area and germinate.
它主要通过地下茎传播；当根系统碎片或整个植物漂浮到一个区域并生根，或当种子漂浮到一个合适的区域并发芽时，菌落就形成了。
The Underground station at Liverpool Street was closed because of overcrowding. Revellers unable to take the train staged an impromptu party on the concourse instead.
利物浦街的地铁站因为过分拥挤，被关闭。狂欢者无法坐火车，转而在中央大厅上演了即席晚会。
Take the Loess Plateau for an example, there are various changes in temperature of underground water with steppe belt, forest steppe belt and forest belt.
拿黄土高原来说，就有草原带、森林草原带和森林带等不同地带性水热特征。
Take the Loess Plateau for an example, there are various changes in temperature of underground water with steppe belt, forest steppe belt and forest belt.
拿黄土高原来说，就有草原带、森林草原带和森林带等不同地带性水热特征。
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