市场上葡萄正热卖，
个大味甜，好看又好吃……
可是慢着，
为啥葡萄表皮上还有一层“白霜”？
像是搽粉搽多了。
网上有人说，
“白霜”是农药残留，
这样的葡萄不能吃！
这是真的吗？
这层白霜到底是什么呢？
其实，
不仅葡萄表面有白霜，
在李子、蓝莓、甘蔗等水果上
你也会发现这种现象。
这“白霜”不是什么农药，
而是葡萄表皮细胞本身分泌的一种糖醇类物质，
专业上称之为“果粉”。
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