我们将把“有方向的图”简称为方向图。

We shall abbreviate the "directed graph" to digraph.

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达尔文告诉我们进化是没有方向的。

Charles Darwin taught us that evolution has no direction.

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对于一只盲目的船来说，所有方向的风都是逆风。

For a blind ship, all the direction of the wind is the wind.

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And it follows qualitatively from just your ordinary observations a bout the direction in which things go spontaneously, right.

定性地来说,就是你们日常生活中观察到,自发进行的物理现象,会有方向性。

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So there's different aspects. There's many people here who are focused on the local government,

所以有不同的方向。这里有好多人专注于本地政府，

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So any time you have two atoms bonding, the bond axis is just the axis that they're bonding along.

任何时候如果你有两个原子成键，键轴就是它们成键的方向。

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