Michael Jackson's death led many of Pakistan's local television channels Friday morning, knocking the near constant coverage of the military campaign against Taliban militants off the top of the news lineup, if only for a few hours.

VOA: standard.2009.06.26

many of these ion channels have this size exclusion pore, it's a very important part of them.

很多离子通道也都有这样的具有尺寸排斥性的小孔，这是它们非常重要的组成部分。

麻省理工公开课 - 化学原理课程节选