[问题讨论] 讨论:如何进行恒星际通讯 |
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50mm口径目视一族
50185+3.5mm+11mm+19mm+gp2 |
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Knowing more and more about less and less
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互相尊重,互相理解,共同提高
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you have a strong heart ,no fear...
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you have a strong heart ,no fear...
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