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| 31. | If the temperature drops to zero degrees centigrade, water freezes. |
| 如果温度降至零度，水便结冰了。 |
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| 32. | One that descends. |
| 下降者，下降物 |
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| 33. | Zero, five, fifteen, twenty, thirty! |
| 零度，五度，十五度，二十度，三十度! |
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| 34. | The temperature indicated by the numeral0 on a thermometer. |
| 零度温度计上数字0所示的温度 |
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| 35. | Water becomes a solid at 0℃. |
| 水在摄氏零度时变成固体。 |
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| 36. | A downward trend;a downturn. |
| 下降趋势；下降（衰落） |
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| 37. | downward trend |
| 下降趋向;下降趋势 |
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| 38. | The temperature of the hibernating animals falls to just below zero centigrade. |
| 动物冬眠的温度正好是摄氏零度。 |
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| 39. | Zero degrees Fahrenheit equals17.8 degrees below zero Centigrade. |
| 华氏零度等于摄氏零下十七度八。 |
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| 40. | isostatic depression |
| 均衡下降;均衡下降 |
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