VOA慢速英语:专家研究大脑损伤与美式足球之间的联系

collision– n. : a crash in which two or more things or people hit each other

donate – v. to give (money, food, clothes, etc.) in order to help a person or organization

dementia – n. medical a mental illness that causes someone to be unable to think clearly or to understand what is real and what is not real

startling – adj. : very surprising, shocking, or frightening

helmet – n. a hard hat that is worn to protect your head

diagnose – v. to recognize (a disease, illness, etc.) by examining someone