31. | Mix up the salt with the pepper. |
| 把盐和胡椒粉混合在一起。
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32. | Salt preserves food from decay. |
| 盐能防止食物腐烂。
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33. | The salt was specially purified for use in medicine. |
| 用于药中的盐是专门提纯过的。
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34. | This salt has been purified for use in medicine. |
| 这种盐已被提纯供医药上用。
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35. | The acid and alkali are combined in a salt . |
| 酸和碱中和成盐。
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36. | On concentration of sea water we obtain salt . |
| 海水经浓缩后得到盐。
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37. | What is the concentration of salt in sea water? |
| 海水中盐的浓度是多少?
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38. | Scientists are working on the conversion of salt water into fresh water. |
| 科学家正致力于研究海水淡化问题。
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39. | Salt forms crystals. |
| 盐会结晶。
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40. | Evaporate a little seawater on a porcelain dish; on cooling, crystals of common salt will deposit on the sides of the dish. |
| 将少许海水放在瓷碟中蒸发,冷却后即有食盐的结晶附着在瓷碟的四周。
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