中英释义：
双语例句
软件在线升级是数字机顶盒的一项基本功能.
Software online updating via network is one of essential functionalities of digital set top boxes.
重点词汇
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在线
online; be online; on line
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升级
upgrade; upscale; enhance; advance; step up; move up; level up; escalate; intensify; upgradation; escalation; enhancement; upgraded; enhanced