They lack water-storing structures, and their existence on rock faces prevents them from tapping groundwater, so they have instead developed the ability to change their metabolism.

它们缺乏储水结构，而且它们长在岩石表面，这阻止了它们利用地下水，所以它们反而形成了改变新陈代谢的能力。

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He recruited local masons to quarry granite blocks out of the rock faces, and he and his disciples hauled bags of cement and roof tiles up to the site.

他雇佣本地的泥瓦匠从岩壁上凿出花岗岩块，自己和徒弟们则负责将大包的水泥和瓦片抬到峰顶的建筑工地上。

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On the second evening of the trip, as we pulled away from Perm, we hit a glorious stretch incorporating streams, dramatic rock faces and beautiful forests, all bathed in the last of the day's sun.

第二天傍晚离开帕姆（Perm）的时候，我们看见一段汇合在一起的溪流欢快地流淌，还有险峻的岩石和美丽的森林，一切都沐浴在夕阳的余晖中。

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Giant faces of four great American presidents are cut into the rock near the top of Mount Rushmore in the Black Hills.

VOA: special.2009.03.04

Cherry and apple orchards line whispering mountain creeks, which suddenly burst into waterfalls on exposed rock faces.

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Footpaths wind gently upward to the Berber hamlet of Tamatert, wedged snugly between two stern rock faces.

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The pigeon houses riddling the rock faces, traditionally used to collect the birds' droppings for use as fertiliser, mostly stand empty.

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