在境况最好的时候，重新开始锻炼身体也可能是一项挑战，但如今许多人都无法去健身房或参加面授的健身课程，就更是连从何处入手都很难知道。

Getting back into exercise can be a challenge in the best of times, but with gyms and in-person exercise classes off-limits to many people these days, it can be tricky to know where to start.

youdao

至理名言是鼓励性话语，使人如沐春风，重新焕发活力，赐予人面对挑战时重新振作的力量，使人变得更加坚定。

Quotes are words of encouragement which can make you feel rejuvenated again, it gives you the strength to rise up against any challenge and makes you more determined.

youdao

So the challenge thing comes back to the instruction of designer: what are you for on this access?

这样，教育设计者,又重新面临着挑战：,你会支持这项技术吗？

麻省理工公开课 - 媒体、教育、市场课程节选