这个外部网络支持前台和后台活动。
This external network supports front and back office activities.
我们从一开始订立的原则就是内容，而非Chrome本身：要让网络程序打前台。
The principle that we've stuck to from pretty early on was content, not Chrome: allowing Web applications to live front and centre.
从数据管理的角度出发，对网络自动售货机的数据特点进行分析，并对前台数据的传输协议进行了研究与制定。
From the view of data management, this paper analyzes the character of data for vending machine based on network and makes the transmission protocol of the front data.
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