• She was never willing to leave a problem unfinished, even difficult problems in mathematics.

    VOA: special.2009.11.08

  • It's a difficult problem that not everyone is smart -they vary in their ability -so we try to make a world in which it's pretty safe for the small investor who's not paying attention.


    耶鲁公开课 - 金融市场课程节选

  • It shouldn't be difficult to see a kind of problem that is beginning to arise in Milton's text here.


    耶鲁公开课 - 弥尔顿课程节选

  • Hobrooke admits is a very complicated and difficult problem to address.

    VOA: standard.2009.06.15

  • Well, I talked about the problem of using plasmids in gene therapy, that it's very difficult to get them into cells.


    耶鲁公开课 - 生物医学工程探索课程节选

  • But for people who have a difficult time controlling their movements, this little navigational issue can be a really big problem.

    VOA: special.2011.04.18

  • Part of the problem with using operant conditioning with babies is it's difficult to get them to behave in any systematic way.


    耶鲁公开课 - 心理学导论课程节选

  • Today,the solution to the problem is so common that it is difficult to understand that there was a problem at all.

    VOA: special.2010.07.14

  • I cannot even make it look hard because I have memorized this problem from childhood, so there is no way I can make this look difficult.


    耶鲁公开课 - 基础物理课程节选

  • The most difficult national problem facing the administration of President Franklin Pierce was the situation in Kansas.

    VOA: special.2009.05.07

  • In many ways for Aristotle as it is for every student of politics the most serious the most difficult issue one confronts is the problem of faction.


    耶鲁公开课 - 政治哲学导论课程节选

  • "The problem with that body of research is that it's difficult to interpret because obviously people with existing mental health problems use cigarettes to self-medicate."

    VOA: standard.2010.06.15

  • Now, as I said last time, the subject of free will--or free will, determinism, causation and responsibility, this cluster of problems-- is an extremely difficult and complicated physical problem.

    正如我上次所说的,自由意志这个主题 或者说自由意志,决定论,因果论,责任,这一堆问题,是极端困难和复杂的物理问题

    耶鲁公开课 - 死亡课程节选

  • There was a conditional agreement: yes, Norway should manage this oil risk but it's politically difficult and that's the problem-- is that we're not able to do our optimal management.


    耶鲁公开课 - 金融市场课程节选

  • In fact there's research-- for example, this was done with internists, doctors, who are giving a very difficult, very difficult question connected to a liver problem that an individual patient had.


    哈佛公开课 - 幸福课课程节选

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