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2011-10-31
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2011-10-19
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2011-10-19
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2011-10-12
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2011-10-11
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2011-09-09
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2011-09-01
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2011-08-21
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2011-08-08
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2011-08-06
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2011-08-03
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2011-07-29
一直以來,我們只知道地球有一個衛星月球,伴著地球旋轉,但加拿大科學家去年發現,原來地球一直另有一個忠誠小同伴─一顆直徑 275米的小行星,一直伴隨著地球圍繞太陽公轉。
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2011-07-26
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2011-07-09
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2011-07-19
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2011-05-18
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2011-05-17
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2011-05-05
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2011-05-03
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2011-04-18