一些基本的公共卫生问题，例如脏手而不是肥皂习惯，仍然是棘手的问题，仅仅因为我们无法弄清怎么去改变人们的习惯。

There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can't figure out how to change people's habits.

youdao

你们避免的是棘手的问题。

You avoid tricky issues.

youdao

多年来，军事存在及其对日本居民的影响一直是一个棘手的问题。

Military presence and its impact on Japanese residents have been a thorny issue over the years.

youdao

That really is the question we are wrestling with and, of course, behind it all is can we seek any historical information from Homer's poems at all?

这确实是一个很棘手的问题,不管怎样,我们是否能从荷马史诗中,得出当时的史实呢

耶鲁公开课 - 古希腊历史简介课程节选