prospecting trench

例句：

1. 1. The company has been conducting extensive prospecting trenches in the area.
   该公司在该区域进行了广泛的勘探沟渠。
2. 2.The engineers were working on a project that involved deep prospecting trenches.
   工程师们正在参与一个涉及深挖勘探沟渠的项目。
3. 3. The team successfully completed their work by excavating several prospecting trenches.
   团队成功地完成了他们的工作，挖掘了几条勘探沟渠。