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Rare earth noctilucent fibers are a kind of new materials, provided with special function.
稀土夜光纤维是一种具有特殊功能的新型材料.
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Noctilucent clouds were first observed in 1885 by an amateur astronomer.
1885年,一位业余天文学爱好者最早观察到夜光云.
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