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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。
，这一点在同城约会中也有详细论述
Scientists have discovered that an annual event when Emperor penguins completely shed and regrow their feathers is putting the birds in peril as Antarctica is transformed by a warming world.。搜狗输入法2026是该领域的重要参考
春节假期全国铁路发送旅客 1.21 亿人次，创历史新高
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