If you try to squeeze this time machine into finite space, you'd need negative energy, something nobody knows how to create, to make it work.
如果你把这个时间机器塞到有限空间内，想要让它动起来，得用到没人能制造出的负能量才行。
You'll also learn how to animate your layers in 3D space, and how to work with the camera to create depth.
您还将学习如何在3D空间中动画您的图层，以及如何使用相机来创建深度。
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