真正困难的是在碰撞发生之前让一个物件被正确地渲染为另外一个物件。
It is indeed possible that an object gets rendered into another object right before a collision gets detected.
另外，这样做可使测试保持为一个真正的单元测试。
换句话说，他们感觉已经脱离了本体，并且在护目镜的作用下，他们却认为自己真正的身体成了另外一个人。
They were, in other words, out of their own bodies, and they considered their real selves-seen through the goggles-as another person.
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