大部分食物是新鲜吃比较好,但有些新鲜的食物是吃不得的。比如,海蜇就不能吃新鲜的。新鲜的海蜇含水多,皮体较厚,还含有毒素,只有经过食盐加明矾腌渍三次(俗称三矾)使鲜海蜇脱水三次,才能让毒素随水排尽。三矾海蜇呈浅红或浅黄色,厚薄均匀且有韧性,用力挤也挤不出水,这种海蜇方可食用。 Most of the food is fresh to eat better, but some fresh food is not edible. For example, jellyfish can not eat fresh. Fresh jellyfish watery, thick skin, but also contains toxins, and only after salt and alum salted three times (commonly known as three alum) so that fresh jellyfish dehydration three times, in order to allow toxins with water exhausted. Three alum jellyfish was light red or light yellow, uniform thickness and toughness, hard squeeze also squeeze no water, this jellyfish before consumption.