And the trick to a puzzle box is there's a simple way to get out but you have to kind of pull on something, some special lever, to make it pop open.

这个谜笼的设计是这样的,只要小猫拉动一个东西,它就能够逃出去，拉动一个特殊的杠杆，迷笼就会打开。

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A simple device, such as a lever, a pulley, or an inclined plane, that alters the magnitude or direction, or both, of an applied force; a simple machine.

机械装置一个简单装置，如杠杆、滑轮或斜面刨，可以改变作用力的大小或方向或同时改变；简单机械装置。

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The main strap can be tightened with a pretty simple tug on the inside lever.

主要的束带可以借由简单的扳动中央拨杆来束紧。

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And the trick to a puzzle box is there's a simple way to get out but you have to kind of pull on something, some special lever, to make it pop open.

这个谜笼的设计是这样的,只要小猫拉动一个东西,它就能够逃出去，拉动一个特殊的杠杆，迷笼就会打开。

耶鲁公开课 - 心理学导论课程节选

There's all these pleasures of experiencing art and seeing a beautiful sunset. And I don't know about you, but at least when I imagine the rat lever thing, it's a sort of simple, undifferentiated pleasure.

体验艺术是快乐的,观赏美丽的日落是快乐的，我不了解你们，但当我想象老鼠杠杆时，那是一种简单，单调的快乐。

耶鲁公开课 - 死亡课程节选

We decided to exclude the traditional list of "simple machines, " which includes the lever, pulley, wheel and wedge, since most other tools employ some form of simple machine--a hammer is basically a lever, and an axe is essentially a wedge.

FORBES: Methodology

Just make sure you're facing off against a trustworthy opponent, as NERF is relying on the honor system and it's pretty simple to just flick the lever in the basket to rack up points.

ENGADGET: NERF Cyberhoop hands-on: foam basketball for the iPad generation