Trenching and excavation

• 挖沟和挖掘

Trenching and excavation的用法和样例：

例句

1. Elsewhere, two plates may shift toward each other and converge along a deepsea trench and island arc.
   在别的地方，两块板块又可能相向移动而沿着深海沟和岛弧逐渐聚合。