名詞 mental illness:

1. any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention
   同義詞：mental disease, psychopathy

1. Mental illness can create a sense of alienation from the real world.
   精神病能產(chǎn)生一種與現(xiàn)實(shí)世界脫離的感覺(jué)。