求翻译：　　一般每100克水果含30卡左右热量，而在水果当中含热量较多的香蕉(89卡)，芒果(88卡)被误解为高卡水果。其实，它们都是负卡路里食物。负卡食物并不神秘，它们就是我们经常吃到的蔬菜、生果和果仁类食物。是什么意思？

　　Generally around 30 card per 100 grams of fruit and heat, but in banana fruits which contain more calories (89), mango (88) be misinterpreted as a high card of fruit. In fact, they are all negative calorie food. Negative card and food is not mysterious, which is that we often eat vegetables, fruit, and nuts food.