但到晚期
But in the late stage
以上为机器翻译结果，长、整句建议使用 人工翻译 。
一般而言，杀虫蛋白的含量在棉花生长发育的前期较高，到中期时有所下降，但到晚期时则又有回升。
Generally, insecticidal protein levels were high during the early stages of cotton growth; they declined in mid-season, and rebounded in late season.
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