单词：high voltage switchgear equipment
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Americans shower their loved ones with gifts on Valentine's Day, with chocolate being the most popular gift-giving item, according to a recent National Retail Federation survey. The organization estimates consumers will spend $1.7 million on chocolat
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Bird on a Wire 当我们行走在马路上时，经常可以看到成群的麻雀或乌鸦停落在几万伏的高压电线上，它们不仅不会触电，而且一个个显得悠闲自得。可是，你也知道，如果有人不小心碰到高压线
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