在海洋退回到主要的海洋盆地之前，每日天气和季节性气候发生了剧烈的变化。

Extreme changes in daily and seasonal climates preceded the retreat of the seas back into the major ocean basins.

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季节性情感障碍，简称SAD，是另一种常见类型的抑郁症。通常发生在北方性气候地段。

Seasonal affective disorder, or SAD, is another common type of depression that often occurs in northern climates.

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季节性情感障碍，简称SAD，是另一种常见类型的抑郁症。通常发生在北方性气候地段。

Seasonal affective disorder, or SAD, is another common type of depression that often occurs in northern climates.

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