在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。
In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.
Michael从倾斜的坡道中滑下来，原来底下是一个大型垂直排水管的最底端，这个排水管好似一个竖井。
He emerges from the sloped pipe of the very bottom of a huge vertical drainpipe resembling a silo.
介绍了竖井施工中有关基坑排水、混凝土浇筑以及侧壁模板等设计问题。
In this paper, designs for foundation pit drainage, concrete pouring as well as side wall form, etc in shaft well construction are discussed.
介绍了竖井施工中有关基坑排水、混凝土浇筑以及侧壁模板等设计问题。
In this paper, designs for foundation pit drainage, concrete pouring as well as side wall form, etc in shaft well construction are discussed.
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