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。

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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。

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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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Only a few city blocks remain under government control.

VOA: special.2010.07.17

The media interpreted this to mean that like Olmert, Netanyahu expects for Israel to retain perpetual control over large blocks of Israeli communities that take up less than 10% of the overall landmass in Judea and Samaria.

CENTERFORSECURITYPOLICY: Fool me twice

Players have the ability to control their attacks and blocks in realtime with the mouse for the most precise and dynamic melee combat ever experienced in a multiplayer game.

FORBES: 'Chivalry: Medieval Warfare' Is An Unreal-Based First-Person Melee Combat Game

But as soon as the white working-class inhabitants of architecturally enlightened tower blocks gain any control over the matter, they tend to move to the suburbs.

ECONOMIST: Suburbs