射电天文学在过去的十年里在物质的宇宙打开了一扇新的窗户。
Radio astronomy has in the last decade opened a new window on the physical universe.
它是人们于1951年发现的太空氢原子的天然发射频率，宇宙间任何一种射电天文学家都必定知道它。
It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951; it must be known to any kind of radio astronomer in the universe.
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