三轨道系统确保盒子传输平稳。

Three-rail system ensures the stable transportation of boxes.

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发现号的人在这三轨道规划的第一个轨道上行走。

It's the first of three planned orbital excursions for the Discovery crew.

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如果你的餐盘里有四分之三的食物都是蔬菜、水果和全谷类食品，那么你就自动走上了有益心脏健康的轨道。

You'll automatically be on the right heart-healthy track if vegetables, fruits and whole grains make up three quarters of the food on your dinner plate.

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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

When you are done you have three electron pairs in bonding orbitals.

当你完成的时候,成键轨道上共有三对电子。

麻省理工公开课 - 固态化学导论课程节选