mental sickness

• 精神疾病

mental sickness的用法和样例：

例句

1. Society has also shifted its view of the causes of mental illness.
   人类社会对于精神疾病成因的看法，也有过改变。
2. More than three million people suffer from severe mental illness.
   有超过三百万的人患有严重的精神疾病。