keep fresh短语¹⁴⁴⁹⁷²⁺² 基本例句 保鲜 The effects of keep fresh liquid with different concentration of sugars on the life, flower stem, flower quality of carnation during the keep fresh time were studied in this experiment. 本实验对不同糖浓度的保鲜液影响香石竹切花在保鲜期间的寿命、花径、品质等方面进行了研究。 cnki