1、Therefore, in the milling back trenching session should note the following points.
因此，在銑背拉槽環(huán)節(jié)中應(yīng)注意以下幾點。

2、It established the theoretical base for the design of trenching implement.
為挖溝器的設(shè)計奠定了理論依據(jù)。

3、A large number of leak: to build a causeway or trenching asylum.
大量泄漏：構(gòu)筑圍堤或挖坑收容。

4、Various trenching methods and pipe geometries are used.
各種方法和管道幾何挖溝使用。

trenching翻譯