mental disease

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

(4)老年期精神疾的症状极不稳定，有时是变化无的。

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的情感性精神疾，已成为现代社会的、多发。