The only rule for defining a filter is that it must let events of the desired kind pass and block all others.

定义筛选器的唯一规则在于，它必须允许所需类型的事件通过并阻止所有其他事件。

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Any caller that attempted to pass a task to a pool thread would find the pool empty, and its thread would block while it waited for an available pool thread.

试图向池线程传递任务的调用者都会发现池为空，在调用者等待一个可用的池线程时，它的线程将阻塞。

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This time, Di Maria took out the middleman, intentionally handling the ball to block a Vallecano pass that resulted in his second booking of the match.

这次，迪玛利亚出任中场，故意手球阻止瓦列卡诺传球导致他被出示第二张黄牌。

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And even if he enabled such resolutions to pass, Congress would likely block US participation in enforcing them.

CENTERFORSECURITYPOLICY: Facing our fears

The Bruins would get no closer, with Crosby providing a fitting ending by getting on his stomach to block a centering pass just before time expired.

NPR: Penguins Beat Bruins 2-1 To Run Win Streak To 9

It can be set for a number of different games - with names such as Block It, Pass and Receive, and On the Spot - designed to hone different aspects of a player's skills.

BBC: Kevin Keegan launches football training systems