停止阀: cut off out valvecut off valvecut out valvestopvalvestovalvevalve， shut offvalve， stop
Example Sentences:
1.
Canceling a task this way is useful if you want the iterator - rather than the task - to control when the scheduling stops 如果您想用迭代器而不是任务来控制计划停止时间时，就用得上这种取消任务的方式了。
