The researchers said that the number of actinic keratoses declined from an average of 11.6 lesions per person to an average of 1.5 lesions.是什么意思_The researchers said that the number of actinic keratoses declined from an average of 11.6 lesions per person to an average of 1.5 lesions.在线翻译_英语_读音_用法_例句