一些山脉是由于这些板块相互碰撞，迫使板块边缘的岩石向上移动而形成的。

Some mountains were formed as a result of these plates crashing into each other and forcing up the rock at the plate margins.

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现在检验和屏幕边缘还有挡板的碰撞是否是期望的那样。

Here you check if the collisions happen with the screen borders and paddle as expected.

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我有两个正方形画在屏幕上，我怎么能检测到碰撞对象的边缘?。

I have two squares drawn on the screen, how can I detect collision on the edges of both objects?

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