只要有一块橡皮泥、一枚宽头钉和一枚窄头钉,你很容易就能看到这一原理是如何运作的。
You can easily see how this works with a piece of modeling clay, a nail with a wide head, and a nail with a small head.
只要有一块橡皮泥、一枚宽头钉和一枚窄头钉,你很容易就能看到这一原理是如何运作的。
You can easily see how this works with a piece of modeling clay, a nail with a wide head, and a nail with a small head.
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