这种膨胀能够导致空气温度降到零度以下的程度。
This expansion can cause the temperature of the air to drop to sub-zero levels.
有研究表明，在零度以下的空气里跑步不会对肺部有任何损害。
SOLUTION Research has shown that running in temperatures below zero won't harm your lungs.
日本北部大多数受灾地区在气温经常降到零度以下的情况下，仍然没有电力供应。
Most of the affected areas in northern Japan are still without electricity while the temperature in the region has frequently fallen below freezing.
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