A closed system would be, for instance, a glass of ice water with an ice cube in it, with the lid on top.

一个封闭系统可以是，比如说，一杯放了一个冰块的冰水，顶上加了盖子。

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Usually at the beginning of school, the noise of desks being opened and closed, and lessons repeated at the top of the children "s voices could be heard out in the street."

平时，刚开始上课的时候，在街上就能听到课桌开开关关的乒乓声和孩子们一遍遍高声念课文的读书声。

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The applications are started as lightweight windows called panels and the can stay on top of the screen even if one chooses another tab in the browser or it can be minimized or closed.

启动的应用是以轻量级的窗口（叫做面板）形式展现的，即便用户选择了另一个标签，这些应用还可以位于屏幕的最上方，同时用户还能够最小化或是将其关闭。

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The president traveled to Jacksonville after another closed door meeting at the White House with top advisers on Afghanistan.

VOA: standard.2009.10.26

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

He added that it has been closed positively, also thanks to our Jewish friends, and the openness showed by some top Jewish representatives.

VOA: standard.2009.03.12

The boy funnelled the pulque into two used 2L soda bottles and closed the top.

BBC: Mexico��s ancient drink makes a comeback

After the cover is closed, the top LCD shows the current time and wallpaper.

ENGADGET: Hands-on with Motorola's RAZR V3 for Cingular

He closed off the top of the spiral, eliminated natural light and painted all the walls white.

WSJ: Ada Louise Huxtable on Frank Lloyd Wright, From Within Outward, at New York��s Guggenheim Museum