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| 21. | The water can freeze when the temperature descends below the centigrade zero. |
| 当温度下降至摄氏零度以下时，水会结冰。 |
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| 22. | A deposit of minute ice crystals formed when water vapor condenses at a temperature below freezing. |
| 霜冻当气温低于零度时由水蒸气凝结而成细小冰晶的沉积 |
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| 23. | The adventurer started out at midnight in a temperature of30 below zero. |
| 这位冒险家在晚上十二点钟，冒着摄氏零下30度的严寒出发了。 |
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| 24. | The increase in hardness and strength of a ductile metal as it is plastically deformed below its recrystallization |
| 塑性材料于再结晶温度以下进行塑性变形引起的硬度和强度升高现象。 |
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| 25. | treated by heating to a high temperature but below the melting or fusing point. |
| 将之加热至高温但又低于熔点。 |
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| 26. | If the temperature gets below freezing point, we should take the plants indoors. |
| 如果温度低于冰点，我们就应把植物搬入室内。 |
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| 27. | The temperature, well below freezing, made our voices crisper than usual. |
| 我和她谈话的声音，被零度以下的气温所反应也增加了硬度。 |
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| 28. | All other common gases are cooled by expansion at room temperature and below it. |
| 所有其它普通气体在室温和室温以下时都会因膨胀而冷却。 |
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| 29. | a mixture of substances (usually salt and ice) to obtain a temperature below the freezing point of water |
| 物质（通常是盐和水）在水的凝固点以下形成的混合物。 |
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| 30. | The state of a substance that exists below its critical temperature and that may be liquefied by application |
| 水蒸气物质存在于低于临界温度的情况下，并且在施加足够压力情况下能被液化的状态 |
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