Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

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To find the force, what you will do is, suppose somebody says, "Hey, I've got a new force.

为了找出这些力,你们要做的是,假设有人说,"嘿,我发现了一种力

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But cutting is something fearful and forceful; it's a kind of controlled violence. Frost takes it for granted that we will remember that the scythe is a conventional image for time, which harvests all of us in death.

但是割草是很有力的也是很可怕的;,这是一种控制中的蛮力，弗罗斯特认为,我们将把镰刀作为时代的产物记住，镰刀一直收获直到我们死去。

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So force of friction is yet another force.

摩擦力就是另外一种力

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Here's another force you might find.

你可能会发现还有一种力

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Okay, that's a new force.

这就是一种新的力

耶鲁公开课 - 基础物理课程节选