... 昼夜看守 keep watch round the clock 时钟看守 THE CLOCK WATCHER 无人看守 guardless ...
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Equipped with sophisticated cameras, infrared sensors and other detection equipment, the small blimps often float 2, 000 feet over an area to keep a round-the-clock watch.
WSJ: Battlefield Blimps to Patrol U.S.-Mexico Borders
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