This paper introduces controlled blasting technology on signal chamber of pit-bottom and main haulage roadway, which are of complex condition, lithological character and highly security.

介绍了采用控制爆破技术施工位于井底车场及主要运输大巷的信集闭峒室，条件复杂，岩性变化大，要求安全性高。

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The toothpicks will rest on the rim of the glass and hold the pit in place so it doesn’t sink to the bottom.

三根牙签搁在玻璃杯的边上固定住了核，让它就这样不会沉到底。

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With more activity at the site, the reflecting pool was moved to the base of the seven-story ramp leading to the bottom of the pit.

随着工程的进展，水池被移往一个七层高的斜坡底部。

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The bodies of Chloe Jade Arwood, 6, and her cousin James Levi Caldwell, 7, were found at the bottom of a 24-foot-deep pit on Monday morning, more than 12 hours after a wall of the pit collapsed on them behind a family member's home, authorities said.

CNN: Searchers find bodies of children buried by wall of dirt

The children apparently were trying to retrieve a small "child-like pickaxe" at the bottom of the sloped pit when the dirt wall collapsed on them before 6 p.m.

CNN: Searchers find bodies of children buried by wall of dirt