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
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?