Ice helps to preserve food.

冰有助于保存食物。

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So they used salt to preserve food and explored the world.

所以他们使用盐来保存食物和探索世界。

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The ship is equipped with special refrigerating devices to preserve food.

船上有特设的冷藏设备，用来保存食物。

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Salt, used to preserve food, which meant that it could be stored and traded, was an early aid to distribution.

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If America hadn't gone to war, a man named Birdseye wouldn't have figured out he could preserve food for our troops by flash freezing it in cold water.

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Without the pot, we never would have roamed far from sources of fresh water, and wouldn't be able to preserve food to get through famines and harsh weather.

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