Degree e below zero 零下度数
The temperature is three degree below zero.
温度是零下三度。
If the temperature drops below zero degree, water will turn into ice.
如果气温降到零度以下，水就会结冰。
Especially when construction in winter, climate specially cold, outside the temperature below zero degree Celsius, the new constructed fire proofing coating is all easy to ruin by freezing.
特别是在冬季施工时，气候特别寒冷，室外气温都在零摄氏度以下，新施工的防火涂料极易冻坏。
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