Experts tell us, leading to postpartum depression there are usually two reasons, physiological reasons and psychological reasons.
专家告诉我们，导致产后抑郁症的原因通常有两种，生理原因和心理原因。
The physiological structure of skin and the face were introduced. Some physiological reasons which affected the wrinkles were stated.
本文介绍了皮肤及面部的生理结构，简要说明了形成皱纹的生理原因。
These areas of the brain, while little known to most people, are helping scientists explain the physiological reasons behind why we feel what we feel when we fall in love.
这些为大多数人不知的脑部区域，正帮助科学家揭解释当我们坠入爱河是为什么会有那种感受的生理原因。
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