mental disease

(4)SenilePeriod the symptom of mental disease is extremely flabby calm, be fantasticality sometimes.

(4)老年期精神疾病的症状极，有时是变化无常的。

Depression is a common thymogenic mental disease with prominent and persistent low mood as its major clinical feature. It becomes a common disease and frequently encountered disease in modern society.

抑郁症是一种以显著的持久的心境低落为主要临床特征的常见的精神疾病，已成为现代社会的常见病、多发病。