You cannot accurately gauge water depth from inside a car.

因为你无法在车内准确地测量水深。

Use a sturdy stick to gauge water depth in front of you and check the stability of the ground.

用一根结实的棍子测量水深，并检查地面是否坚硬。

A channel fills with sweat to gauge water loss.

一个充满汗水的通道可以测量水分流失。