痴呆症
chī​dāi​zhèng

dementia

痴呆症 chī​dāi​zhèng
dementia noun
a chronic or persistent disorder of the mental processes caused by brain disease or injury and marked by memory disorders, personality changes, and impaired reasoning

痴呆症是一种复杂的脑部疾病，医生们仍然没有完全了解。

chī​dāi​zhèng shì yī​zhǒng fù​zá de nǎo​bù jí​bìng, yī​shēng men réng​rán méi​yǒu wán​quán liǎo​jiě.

Dementia is a complex brain disease that doctors still do not fully understand.

cretinism
(medicine) a condition of severely stunted physical and mental growth owing to untreated congenital deficiency of thyroid hormone