There is often subzero temperature in winter here.
这里的冬季的气温往往在零度以下。
Even in summer the temperature is subzero here.
即使在夏天这里的温度也保持在零度以下。
The hardness variation of D2 steel under different quenching temperature and the influence of subzero treatment on hardness of D2 steel were studied, and its microstructure was analyzed as well.
研究了D2钢在不同温度淬火后的硬度变化，以及深冷处理对其硬度的影响，并对其显微组织进行了分析。
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