dip

/dɪp/

a depression in an otherwise level surface

中文释义：凹陷；低洼

The road has a sharp dip that can be dangerous for drivers.

这条路有一个急陡的凹陷，对司机来说可能很危险。

There is a dip in the ground where water collects after rain.

地面上有一个凹陷，雨后水会积聚在那里。