trenching

the appropriate prospecting techniques include geological mapping and trenching, together with geophysical measurement and streaming geochemical secondary anomaly to control the outcrops of the structural rupture zones, and drilling holes for deep control.

本区合适的勘查手段为，地表以地质填图和槽探工程为主，结合物探测量和化探沟系次生晕的勘查方法来控制（矿化）构造蚀变碎裂带地表露头，中深部采用钻探工程。

Long distance cast iron water pipelines are dealt with in respect of the way of tie-in, trenching, survey, pipe cutting, pipe stringing and the way of lowering-in and burying, as well as the principles of structure of some construction machines.

本文介绍了球墨铸铁长距离输水管道的接口型式、施工工艺、管道开沟、施工测量、管子切割、现场布管、管子下沟敷设安装方法和一些施工机具的构造原理。

A large number of leak: to build a causeway or trenching asylum.

大量泄漏：构筑围堤或挖坑收容。