执行到 sleep 时，线程会进入阻塞状态，操作系统把它挂起，不分配 CPU 时间片。但这个线程仍然被占用着，线程池里它的“坑位”一直没释放。如果同时有 200 个请求进来，线程池的 200 个线程全被占满，都在等 IO，第 201 个请求就得排队，哪怕 CPU 空闲 99%。
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，详情可参考新收录的资料
A consultation process that requires respondents to use a proprietary format produces a structural bias: it disadvantages individuals, organisations, and public administrations that have made the entirely legitimate and EU-endorsed choice to operate on open source software and open formats. A citizen or small organisation using LibreOffice, for instance, may encounter compatibility issues when working with the provided .xlsx template. A government body that has migrated to ODF-based workflows faces an unnecessary obstacle.。关于这个话题，新收录的资料提供了深入分析
FT Edit: Access on iOS and web。新收录的资料是该领域的重要参考