一些科学家主张春天非是始于三月，四月，或者五月。他们认为当夜晚逐渐变短白天开始变长，就是春回大地之时。

Some scientists claim that spring is not March, nor April, nor May, Instead, they say it is the time when the nights are getting shorter, the days longer.

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将这个属性设置得更低或更高会分别使排序键变短或变长。

Setting this attribute lower or higher makes sort keys shorter or longer, respectively.

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很多人在黑夜变长、白天变短的冬季都会感到心情低落，但有些人则会感到缺乏动力、疲倦和抑郁。

Feeling low as the nights draw in and the days get shorter is something many people experience, but some will struggle with lack of motivation, tiredness and depression.

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