想想你上一次绞尽脑汁地做一道数学题或者挑战体力极限的情形吧。

Think about the last time you grappled with a math problem or pushed yourself to your physical limits.

youdao

想想你上一次绞尽脑汁地做一道数学题或者挑战体力极限的情形吧。

Think about the last time you grappled with a math problem or pushed yourself to your physical limits.

youdao