* Each solid progress should be committed in the git repository.
Monday’s snowball fight, which appeared to be organized by social media content producers, caused a chaotic scene as a large crowd amassed at the popular park to wing snowballs at each other during a winter storm.
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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。