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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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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LCD displays also use shutters, in effect, consisting of liquid-crystal elements whose polarisation can be changed to block light or let it pass.

实际由液晶分子组成的LCD显示屏也采用了百叶窗，分子的极化转变可阻挡光或让其通过。

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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.

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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

Petri Pasanen managed to block Ljungberg's pass to Reyes with a sliding tackle, but the ball broke kindly for Henry, who finished with aplomb.

BBC: SPORT | Football | FA Cup | Portsmouth 1-5 Arsenal