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DEEP SKY

Known unknowns

作者:DANIEL DAUGHERTY
Aa
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披着“隐身衣”的暗物质到底是什么东西?

Imagine that the police are chasing (追捕) a criminal who is invisible. How would they catch him? Security cameras would not be able to help. Sending someone to spy (侦察) and follow him would not work too well, either.
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