The decay rate of M-product was stable with low humidity and was accelerated rapidly with humidity higher than 70%.

在相对湿度小于70%时，M衰减速率相对稳定，不随湿度改变而变化； 但当湿度大于70%时，则衰减速率急剧上升。

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The decay rate of M-product was stable with low humidity and was accelerated rapidly with humidity higher than 70%.

在相对湿度小于70%时，M衰减速率相对稳定，不随湿度改变而变化； 但当湿度大于70%时，则衰减速率急剧上升。

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