"What is required of us now is a new era of responsibility Ca recognition on the part of every American, that we have duties to ourselves, our nation and the world, duties that we do not grudgingly accept but rather seize gladly, firm in the knowledge that there is nothing so satisfying to the spirit, so defining of our character, than giving our all to a difficult task."

VOA: special.2009.01.24

And that there's some pull towards the right answer that makes this task difficult.

还有正确答案上的一些干扰,让这个任务变得更加困难

耶鲁公开课 - 心理学导论课程节选

Mr.Obama says he knows Congressional politics will make the task more difficult, and he predicts opponents will wage a campaign to scare the public.

VOA: standard.2009.05.21