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Geography
The study of physical characteristics of earth and the distribution and effects of life on earth, especially that of humans.
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霓虹燈
Chemistry; General chemistry
有符號 Ne 和 10 的原子序數的化學成分。雖然在宇宙中一個很常見的元素,它在地球上是罕見。標準下的無色、 惰性稀有氣體條件下,霓虹燈給出不同的橘紅色發光時使用任一低電壓霓虹燈輝光燈或高電壓放電管或霓虹燈廣告招牌。 ...