ramp up time 1
上升时间1
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Video playback will start at a low bitrate for fast download time and then ramp up to a higher bitrate and quality, up to 1080p with 5.1 audio.
ENGADGET: Xbox Live gets 1080p Zune video store, Netflix browsing, Twitter and Facebook integration
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模块上移
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