研究者认为夜晚和凌晨的寒冷比较方便身体散发热量，增加氧气的可用性，可能比顺风更有利。
The researchers think the cooler night and early-morning temperatures, which would help dissipate body heat and increase oxygen availability, may be more helpful than any tailwind assist.
大概凌晨一点的时候，她说有点累了想回家，于是我们起身往她家走，那天夜里的空气非常寒冷。
At about 1 a.m. she said that she was getting tired, and we set off walking towards her house in the chill night air.
大概凌晨一点的时候，她说有点累了想回家，于是我们起身往她家走，那天夜里的空气非常寒冷。
At about 1 a. m. she said that she was getting tired, and we set off walking towards her house in the chill night air.
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