围成圈的组键的位置根据每根手指的位置而改变。

The positions of the surrounding keys are set in relation to each finger.

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根据手指的位置和用户的偏好，这些组键的位置是可以改变的。

The position of the groups of keys can be varied according to finger positions and a user's preferences.

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表中的外键维护着组间以及组内表之间的管理。

Foreign keys within tables maintain the relationship between intra-group and inter-group tables.

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so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选