尽管夏至这天白昼时间最长，但并不是最热的一天。
Although, this day has the longest daylight, it's not the hottest.
第三组的白昼时间则为每周提前6小时，以模拟向东旅行后造成的时差。
The third group had its 12 hours of light advanced by six hours once a week, mimicking eastbound travel.
冬日恶劣的天气、白昼时间的缩短和家庭的需求等都可能加剧人的压力感。
Winter's harsh weather, shorter hours of daylight and family demands can all aggravate feelings of stress.
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