close off

把 ... 隔离开来, 使隔绝

例句与用法：

A section of a waterway, such as a canal, closed off with gates, in which vessels in transit are raised or lowered by raising or lowering the water level of that section.

水闸用门关住的水道的一部分，如运河。其中通过升高或降低这部分的水位可以抬升或压低运输中的船只

A movable structure used to close off an entrance, typically consisting of a panel that swings on hinges or that slides or rotates.

门一种用于关闭入口活动装置，典型的由一块板上有铰链转动或为拉动式或为旋转式的组合

详细释义：

使隔离

Why was the area closed off to all traffic?

为什么断绝了该地区的一切交通?