如下的规则和建议适用于分区键定义

The following rules and recommendations apply to the partitioning key definition

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分区键定义后，就不能更改。

After the partition key is defined, it cannot be altered.

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下一屏幕(图5)提示您为正确的键定义选择键盘类型。

The next screen (Figure 5) prompts you to choose the keyboard type for the correct key definitions.

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So, for starters we'll keep that as our zero energy, we're going to change it soon to make something that makes more sense in terms of bonding, but we'll keep that as zero for now.

因此，首先我们将会保持零点能的这个定义，但很快我们就会对它进行修改,使它在讨论成键时更合理，但是目前我们还是暂时采用这种定义。

麻省理工公开课 - 化学原理课程节选

So that's exactly what our definition of a pi bond is, so we have one sigma bond, and one pi bond.

这是我们对π键的定义，我们有一个sigma键，和一个π键。

麻省理工公开课 - 化学原理课程节选

So in terms of the carbon hydrogen bond, it's a sigma bond, - because we define it -- any time we are bonding to an atom, we have to keep redefining our bond axis to whatever two atoms we're talking about.

对于碳氢键，它是sigma键，因为我们定义它-,任何时候我们有原子成键，我们要重新定义键轴方向,为我们所讨论的两个原子方向。

麻省理工公开课 - 化学原理课程节选