I don't want to have to deal with heat escaping to the outside environment in a way that might be difficult or complicated to measure or calculate.

我可不想处理跑到,环境中去的热量，那测量或,计算起来会非常麻烦和复杂。

麻省理工公开课 - 热力学与动力学课程节选

Let it be difficult. Don't homogenize it all.

充满困难，不要单一化。

耶鲁公开课 - 旧约导论课程节选

"When you don't speak English, it's difficult to be heard, but the person who votes speaks for himself and the community, " said Ysidra Frias, a Dominican living in Lynn, Massachusetts, who became a U.S. citizen in January 2007.

CNN: First-time voters look to Obama to restore American dream

Small airports don't have rental car terminals and so it'd be difficult to get from that airport to the meeting.

ENGADGET: Terrafugia Transition aircraft first hands-on (video)

In a perfect world, your grandparents wouldn't need a lick of help getting the most out of a smartphone, but let's face it: the devices are complex, and if you don't have the proper motivation, they can be a bit difficult to learn.

ENGADGET: Clarity Pal hands-on, a new phone for senior citizens