渔民们用铅垂线测量河水的深度。

The fishermen ___plumbed the river depth with a weighted line.

科学家们深入研究了这个现象以找出其根本原因。

Scientists ___plumbed the phenomenon to uncover its root cause.

我们需要有人来正确安装厨房的水管。

We need someone to ___plumb the kitchen pipes properly.

确保这根杆子完全垂直地插入地面。

Make sure the pole is inserted ___plumb into the ground.