（二）业务之间具有明显的主附关系。主要业务居于主体地位，体现交易的实质和目的；附属业务是主要业务的必要补充，并以主要业务的发生为前提。
When the track ends—detected either via the ended event or via the stall watcher noticing the currentTime approaching durationit will collect chunks that are stitched together:
，详情可参考safew官方版本下载
This article originally appeared on Engadget at https://www.engadget.com/entertainment/streaming/everything-you-need-to-know-about-streaming-f1-on-apple-tv-190600771.html?src=rss
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