Refer to flow direction arrow on valve nameplate or body.

参照阀门铭牌或阀体上的流向箭头。

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If you look at a movie that's being played backwards, you know it immediately because most things have a distinct time direction attached to them: an arrow of time.

假如你让电影倒带播放，你会发现任何事情都带有明显的时间方向性质，就像有东西拉着他们：时间箭头。

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Here is what it looks like, showing direction of the scrolling marquee (red arrow).

下面是其显示效果，其中显示滚动字幕的方向(红色箭头)。

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Some people like to use an arrow, and the arrow points in the direction of the more electronegative end.

也可以用箭头，箭头指向,带负电的一极。

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That's what this arrow at the right shows, the direction of the flow of information.

这就是右边这个箭头的含义,即信息流动的方向

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p2 p1 is greater than p2. Then I want to reverse direction of time. I want the arrow of time to go so that the gas goes from p2 to p1.

一直推，一直推，p1大于,接下来我想让时间倒流,让气体从p2到p1。p2比p1小。

麻省理工公开课 - 热力学与动力学课程节选

The arrow points in one direction.

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Along the trail, was a marker, an arrow pointing to the right direction (attributed to Brigham Young), to help keep the wagon trains on the right path.

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If a change of direction is needed, the walking stick vibrates, and an arrow appears.

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