炎热的夏天到郊外游玩,出发前到商店买了几瓶牛奶,有经验的人常用一块湿毛巾把奶瓶包起来,并把它放在用厚塑料板做成的盒子里。经过这样的处理,一两个小时后,牛奶不仅没有变质,还相当新鲜呢! 这是为什么呢?你知道吗? 其实,这样可以使牛奶保鲜,主要有两个方面的原因:一是塑料盒,另一个是湿毛巾,这么简单的东西,为什么 Hot summer to the outskirts of play, before departure to the store to buy a few bottles of milk, experienced people often use a wet towel to wrap the bottle, and put it in a box made of thick plastic sheet. After this treatment, an hour or two, the milk is not only no deterioration, but also quite fresh! Why is this? You know? In fact, this can make milk preservation, there are two main reasons: First, plastic boxes And the other is a wet towel, so simple things, why