Three Gorges is the south area in which there covers thick soil and flourish vegetation on the top of the rocks, and the lithology analysis is very difficult.

三峡库区属于南方高植被覆盖区域，岩石上部覆盖着较厚的土壤和茂密的植被，因此岩性分析比较困难，尚无成熟的方法可循。

youdao

The reason? For two hours I've been desperately trying to balance giant rocks on top of each other. And failing badly.

什么原因？要知道，两个小时了，我一直在拼命尝试平衡重叠的巨大岩石。结果惨败。

youdao

The top of the springs' rocks are covered with green biofilms, which use both sunlight and sulfide-naturally occurring chemicals from the springs-to survive.

泉水上部的石块被绿色生物膜覆盖，它通过阳光和硫化物自然的发生化学反应生存。

youdao

At the top of rocks was a man, his body was almost hidden by the storm clouds that hung low over the light house.

VOA: special.2010.05.08

Once you are standing on top of the rocks, staring at nature in its grandest form, you will most likely feel small and irrelevant in comparison.

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For several hours Friday afternoon, a handful of plainclothes security officers hurled rocks onto the crowd from on top of the 11-story parliament building while firefighters aimed hoses to repel demonstrators from the building's entry way.

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We traversed the top of a crumbled aqueduct for a few hundred yards, then reached steep rocks devoid of flora or fauna.

WSJ: Man Versus the Volcano