If your foot feels tense, stand with one hand on a wall for support and place the arch of one foot on top of the ball.

如果你的脚很紧张，一只手倒站在墙面支撑着把一只脚放在球上形成一个拱门。

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The first transistor was about the size of the palm of a hand, with a depth of two matchbooks stacked on top of each other.

第一个晶体管的大小约为手掌大小，有两个叠起来的火柴盒那么高。

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Valves with this option have a hand wheel mounted on top of the actuator for manual valve operation.

配置这种备选件的阀门在执行器顶部安装一个手轮用于手动阀门操作。

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In the other context, you know in a Window and a Windows machine, you close it with the X on the top right hand corner, where do you close it in the Mac?

还有一个就是，在Windows操作系统下,当你要关闭某个东西时，需要点击,右上角的“X“,那在Mac操作系统下呢？

哈佛公开课 - 计算机科学课程节选

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Current broomstick users, by moving their putters away from their chest and creating an un-anchored fulcrum with their top hand, could still make a pendulum stroke.

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