c4 crops
c4作物
以上为机器翻译结果，长、整句建议使用 人工翻译 。
With CO2 concentration enrichment, the leaf stoma density becomes small for C3 crops, but it shows the opposite tendency for C4 crops (maize).
随着CO2浓度升高，C3作物叶片气孔密度变小，C4作物（玉米）呈相反趋势；
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