... low pressure cylinder低压汽缸 low pressure physics低压物理学 low pressure piston低压活塞 ...
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物理学家在30年前就提出了激光制冷的想法，但相关试验基本上都未获成功，而只用低压气体进行了试验。
Physicists proposed the idea of laser cooling 30 years ago, but until now, experiments had been largely unsuccessful and only worked with low-pressure gases.
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