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your laser printer has a mirror galvanometer that's used to steer a laser beam very accurately.
你的激光打印机里有一个镜式电流计用它可以很准确地控制激光光束。
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your laser printer has a mirror galvanometer that's used to steer a laser beam very accurately.
你的激光打印机里有一个镜式电流计用它可以很准确地控制激光光束。
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