1、To block off or obstruct(a pipe or valve, for example).
阻塞（如管道或閥門）

2、Call me that again and I will knock your block off !
你再那么叫我，我就揍你。

3、To block off or obstruct(a pipe or valve, for example)
阻塞（如管道或閥門）

4、If you block off the exit, they cannot get out of there.
如果你把出路給堵住，他們就出不來了。

5、Gillette: how to block off apery?
吉列刀片：怎樣阻擋摹仿者？