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。
You call mediaSource.addSourceBuffer(mimeType) to declare what codec format you’ll be feeding the buffer.
，这一点在旺商聊官方下载中也有详细论述
NFTs also contain smart contracts—small computer programs that run on the blockchain—that give the artist, for example, a cut of any future sale of the token.，推荐阅读搜狗输入法2026获取更多信息
Nasa announces change to its Moon landing plans