When the closed channel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valve seat.

当关闭通道时，用阀杆的楔形头使球体涨开与阀座压紧达到密封。

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Mud valves and Angle by the hydraulic cylinder type combination valve, hydraulic power drive cylinder valve lift, the valve open or closed channel, in order to achieve the fluid off.

排泥阀产品由液压缸和角式截止阀组合而成，液压缸内动力带动瓣升降，使阀体通道开或闭，以达到流体通断。

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With any social network, adding a contact doesn't necessarily open an otherwise closed communications channel with that person; it merely invites such openings.

对于任何社交网络，“添加好友”并不一定意味着和别人建立尚未开通的交流渠道，它只是提供了一种可能性。

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That's shown functionally here but recovery means that this sodium channel becomes closed again.

在此展示了这项功能,恢复代表着钠离子通道再次关闭

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A state where it's closed, so imagine a channel with a lid on top of it; when it's closed nothing can go through the channel, when it's open then things can go through.

一种是闭合状态,想想一个有盖子的通道吧,当盖子合上的时候任何东西都不能通过,而打开时就畅通无阻

耶鲁公开课 - 生物医学工程探索课程节选

So, for example, if we look at sodium channels, and sodium channels are some of the particularly prevalent ones when we're talking about neurons, if you think about the cell membrane, and this little green cartoon is me trying to show a sodium channel here, and in this case, you can see that it's closed, such that no ions are getting through.

比如，让我们来看一下钠离子通道，钠离子通道是我们会经常遇到的几个之一,在讨论神经元的时候，如果大家想想细胞膜，而这个绿色的小示意图就是我用来表示,钠离子通道的，在这种情况下，大家可以看到它是关闭的，因此没有离子可以通过。

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Authorities have closed the shipping channel and were letting the fires burn.

CNN: Two fuel barges on Alabama's Mobile River explode; 3 hurt

The Coast Guard has closed the shipping channel for one nautical mile around the scene while fire and Coast Guard crews work on a plan to secure the heavily damaged barges.

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The shipping channel was closed as a precaution.

NPR: Houston Drill Tests Agencies' Preparedness