ash-trench system 水力除灰沟道系统
soakaway trench system 渗水管系统
arc-trench system 弧沟体系
open trench system 明渠排水法
arc-trench-basin system [海洋] 沟弧盆系
trench shoring system 沟槽支撑系统
The last object within this update we have for you is a PAK trench system, also with an attached bunker.
我们为你呈上的本次更新的最后一样东西就是PAK战壕系统，也是跟一个碉堡连在一起的。
The structural and evolutional model of the Mesozoic are-basin-trench system in California has been attracting the attention.
加利福尼亚中生代弧-盆-沟系的构造和演化模式一向为世人所重视。
The typical trench system in World War I consisted of a series of two, three, four, or more trench lines running parallel to each other and being at least 1 mile (1.6 km) in depth.
第一次世界大战时典型的堑壕体系由2至4条以至更多的一系列壕沟组成，壕沟之间彼此平行，而且纵深可以达到1英里（合1.6公里）。
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