As a last step in a poll operation, all control blocks are cleaned up.
作为poll操作的最后一步,要清除所有控制块。
Only control blocks that have been added to an event list are serviced.
只为已经添加到事件列表中的控制块提供服务。
This way we can be sure that web control blocks any harmful web sites from the children.
这么做我们就可以确信网络控制会阻止孩子打开任何有害网站。
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