当你在一条直线上下挥动手臂时，它的意思是“是的”。

When you wave your arms up and down in a straight line，it means"yes"．

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我们需要注意这个观点，即艺术的发展是在一条直线上发生的，表现形式从简单到复杂。

We need to be careful with the idea that artistic development occurs in a straight line, from simple to complex representations.

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脚尖的方向和小腿在一条直线上。

Place your feet in line with your shins.

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If I have Avogadro number of these things in a long line, you can bet it is going to be a solid.

如果在一条直线上,这些东西有阿伏伽德罗常数那么多，你肯定会说它是固体。

麻省理工公开课 - 固态化学导论课程节选

So, when the voltage difference between the plates is zero, or when we just don't have the plates there at all, the cathode rays are not bent, they just go right in a straight line, and they can be detected on this screen.

拐弯来测试它们是否带电,当两板之间电压为零，或者根本就,没有这两个板时，阴极射线是一条直线,它可以在屏幕上。

麻省理工公开课 - 化学原理课程节选

The budget constraint is a straight line through this point with a slope of .

这个预算限制在这幅图上是一条,是一条经过该点并以为斜率的直线

耶鲁公开课 - 金融市场课程节选