mental disease

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

(4)老年期精神疾病的状极不稳定，有时变化无常的。

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.

抑郁种以显著的持久的心境主要临床特征的常见的情感性精神疾病，已成现代社会的常见病、多发病。