纵观整个历史，很明显要是食物没经过某种形式保藏吃了就会使人生病。
It was quite evident throughout history that foods without some form of preservation could create illness after consumption.
控制害虫、保藏食物以及包装、贮藏和推销农产品的新方法发明了。
New ways have been found for controlling harmful insects, for preserving food, for packaging, storing and marketing farm products.
或者购买电冰箱，保藏有营养的食物。
Perhaps they purchase a refrigerator to store a lot of nutritious food.
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