... 真空氧气分压计 vacuum oxygen partial pressure gauge 真空路径 vacuum path 真空发光器 vacuum photoemissive cell ...
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vacuum-path spectrometer 真空分光计
vacuum flight path 真空飞行弹道
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Despite the fact that it is probable that a black hole lurks at the centre of our Milky Way galaxy, astronomers still know very little about these celestial monsters which vacuum up almost everything in their path, even light.
BBC: Black holes reveal more secrets
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