There are three major constraints on streaming video to a mobile device over the air: wireless spectrum, backhaul, and the device itself.
把流媒体视频无线传送到移动设备存在三大问题：无线带宽、回程，以及设备本身。
This means that during the duration of a Comet streaming style communication, at least one connection is tied up on each system from the client device to the backend server.
这就意味着在comet流样式通信持续期间，从客户端设备到后端服务器的每个系统上都至少有一个连接处于不可用状态。
Apple Inc. announced a smaller, cheaper version of its Apple TV device for streaming movies and television shows over the Internet and into the living room.
苹果公司宣布他们研发了一个体积更小、价格更便宜的苹果电视装置，用以将来自网络上的电影和电视节目传导至起居室播放。
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