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| 11. | In hot weather it is rather difficult to preserve food and keep it fresh and safe to eat. |
| 热天很难保藏食品，使之保持新鲜与食用安全。 |
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| 12. | With discoveries in methods to preserve food, almost every kind of food can be frozen and yet keep its |
| 自从发明食物的保存方法之后，几乎样样食品都可以冷藏而仍然保持其原味。 |
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| 13. | The first references are to the use of natural ice used to preserve food products for extended periods |
| 最早是使用天然冰来保藏食品以延长其保质期。 |
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| 14. | Despite a long tradition of efforts to preserve food from spoilage, it was not until the nineteenth century |
| 尽管长期以来人们努力保藏食品免于腐败,但到了19世纪,才开始认真研究由微生物导致的食品腐败。 |
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