精神病是由于大脑功能紊乱而发生的.感觉、记忆、思维、感情、行为等方面表现异常的病。
双语例句：
医生说她有一种精神病,她不能像正常人一样照顾自己。
The doctor said she had a kind of mental disease, she couldn't look after herself like a normal person.
“精神病”这个词很难下定义。
The term 'mental illness' is difficult to define.
精神病并不可羞愧。
Mental illness is nothing to be ashamed of.
许多人在人生的某个阶段都会得精神病。
Many people suffer from mental illness at some point in their lives.
他有精神病，不能对自己的行为负责。
He is mentally ill and cannot be held responsible for his actions.