4.2 坑二：synchronized 锁会让虚拟线程“卡死”载体线程
Once connected, select the option to share your location. The iPhone will record your current location and send it via satellite to the selected contact. During this process, it is important to keep the device steady and follow the visual guidance until the transmission is complete.
。关于这个话题，体育直播提供了深入分析
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commit 9ad6344568cc31ede9741795b3e3c41c21e3156f
class Link[T](Pointer[T]):