More than twenty years have passed since the first commercial GPS receiver was available on the market.
自从市场上第一个商用GPS接收机问世以来已经二十多年了。
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The 3,000 megawatt (MW) power link went into commercial operation on Dec. 9 during an inauguration ceremony at the Huaxin HVDC receiver station on the outskirts of Shanghai, China's largest city.