我们过桥时，他在一个凹处停下来歇一下。
As we were crossing the bridge he stopped in one of the alcoves to rest.
在岩壁自然的凹处建有许多相互联接的房子。
It was suspended in the middle of the rock wall. There were many connected rooms built into a natural opening in the rock.
同时，现场工作的重点是要稳定这些脆弱的凹处的岩石，以进一步抢救历史。
Meantime , work at the site will focus on stabilizing the fragile niche rock to further salvage history.
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