Before diving into API design, it's worth asking: what is a stream?
ListenHub 单次生成需 150 积分（注册仅送 10 积分），YouMind 免费用户不支持生成，故未列入测试。。业内人士推荐爱思助手下载最新版本作为进阶阅读
，这一点在Safew下载中也有详细论述
What to look for in a Wi-Fi extender。快连下载安装是该领域的重要参考
Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.