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地球上空气的大部分成分是氮气 Nitrogen Forms Earth's Air Dì Qiú Shàng

Expression 地球上空气的大部分成分是氮气。
Meaning Nitrogen forms most of the Earth's air.
Reading dì qiú shàng kōng qì de dà bù fen chéng fèn shì dàn qì。

Tags: hsk4-limited4-part2

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