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camera.position.z = 40：这一步很关键！默认情况下，物体在坐标原点 (0,0,0)，相机也在原点。如果你不移开相机，你就跟物体“贴脸”了，什么也看不见。我们把相机往后拉 40 米，就能看清全貌了。
，更多细节参见雷电模拟器官方版本下载
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He has now also called for a trial to compare weight-loss injections with bariatric surgery, where the size of the stomach is restricted to reduce appetite.