授予加州千橡市的一名医生——唐纳德·昂格尔（DonaldUnger），60年来的每一天，他把左手指节掰得咯吱作响，但从不掰右手指节，研究这样做是否会引起关节炎。

To Donald Unger, a doctor in Thousand Oaks, California, who cracked the knuckles of his left hand, but never those on his right, every day for 60 years to investigate whether it caused arthritis.

youdao

授予加州千橡市的一名医生——唐纳德·昂格尔（DonaldUnger），60年来的每一天，他把左手指节掰得咯吱作响，但从不掰右手指节，研究这样做是否会引起关节炎。

To Donald Unger, a doctor in Thousand Oaks, California, who cracked the knuckles of his left hand, but never those on his right, every day for 60 years to investigate whether it caused arthritis.

youdao