这是最基础的构建模块。BoxGeometry 就像捏泥人时的方块，SphereGeometry 则是球体。注意 widthSegments 参数，它决定了球体的精细度——段数越多，球越圆，但计算量也越大。
If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.
，更多细节参见91视频
公安机关应当将传唤的原因和依据告知被传唤人。对无正当理由不接受传唤或者逃避传唤的人，经公安机关办案部门负责人批准，可以强制传唤。
截至2024年底，中国60周岁及以上人口已突破3.1亿，占总人口比重达22% [37]。进入2026年，这一数字将持续攀升，推动银发经济规模迈向12万亿元人民币的大关 [37]。这一领域不仅是国家政策支持的“国补”重点，更是普通人创业与择业的高确定性赛道 [37, 38]。