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訳:花粉症の蔓延の1つの要因は大気汚染です。

(The spread of hay fever)主語 (is partly due to)動詞のかたまり (air pollution)原因.

partly部分的、~の1つ・一部分
air pollution大気汚染(pollutionは他にも公害などの訳)

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