单词：high low voltage relay
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Fred had a red rubber ball. He kicked the ball. It flew through the air. He picked it up. He threw it against a wall. The ball came back to Fred. He kicked it with his foot again. The ball flew over the wall. He picked it up again. He bounced it on t
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Street Artists Add Color to Washington, DC Buildings 街头艺术家在华盛顿特区建筑物涂鸦 Welcome to American Mosaic from VOA Learning English. Im Caty Weaver. Washington D.C. has a graffiti problem. That is a problem it shares with many
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Spray Detects Hard-to-Find Tumors Surgeons may soon have a new tool to help locate early-stage cancerous growths; a spray that turns fluorescent green when it comes into contact with tumors. The spray is clear, but contains a non-toxic dye that almos
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The Minister for the Environment, Dr Nick Smith, said today that the government will spend money on controlling our fresh water and will make some important laws. New Zealand is number 3 in the world for the amount of water per person. We have many r
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