A train appears and heads straight for the camera.

一列火车出现了，径直朝摄像机开去。

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And heads do need to roll.

确实需要动动脑袋。

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They put their pencils and heads down after one or two questions.

只有一两个问题他们会用笔和脑记下。

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These included the first use of "hard hats" to protect the workers' heads and special glasses to protect their eyes.

VOA: special.2010.07.23

As we climbed the air grew cooler and the Indian girls on the road wore shawls over their heads and shoulders.

在我们开车向山上爬行的过程中，空气开始,变得凉爽起来，路上的印第安姑娘都披着围巾。

耶鲁公开课 - 1945年后的美国小说课程节选

This machinery is so precise that a human hair couldn't even pass between the heads and spinning platters, yet it all works in terrific speeds.

这些设备是很紧密的以至于人的头发,都不能在头和旋转的磁盘之间通过，尽管如此，它的运行速度非常快。

哈佛公开课 - 计算机科学课程节选

He picks one according to his mood and heads out early most weekend mornings.

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Yet if the email system burps for 30 minutes, people freak out and heads often roll.

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Wesch teaches anthropology to undergrads and heads up a working group on digital ethnography.

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