One TA Challenge problem will be assigned every 1 to 2 weeks.

每隔一到二周助教会有一题具挑战性的题目。

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Huge hepatocellular carcinoma which holds a large proportion in clinic is a challenge problem for liver surgeons.

巨大肝癌的外科治疗是目前肝脏外科医师临床工作的重点和难点。

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The cognition about the concept of modem tribology and its challenge problem is important the paper introduced our perspectives on this problem basing on teaching and study.

对于坝代摩擦学的定义及其挑战问题的认知，直接关系到摩擦学的学习、研究及攻坚的方向问题。

youdao

A challenge that affects parents, children and citizens in almost every community in America should not be a Democratic problem or a Republican problem.

VOA: special.2010.08.12

And so if you choose to elect the hacker edition of this week's problem set the challenge will be to figure out not only how to implement the game but how to implement a solver for the game.

因此，如果你选择这周的应用题目为升级版,那么你将面临的挑战,不仅是如何实现这个游戏，而且,要实现此游戏的解决方法。

哈佛公开课 - 计算机科学课程节选

Of course, the particular problem of Ireland, the challenge of Ireland as I suggested earlier, has an awful lot to do with that.

特别是爱尔兰的问题,我之前提到的,来自爱尔兰的挑战,也与之也有很大关系

耶鲁公开课 - 欧洲文明课程节选

When reading about any business problem or challenge, how often do you see the problem stated in relative terms?

FORBES: Magazine Article

As he sees it, Republicans face a marketing challenge: the problem is the box, not the pizza.

NEWYORKER: The House of Pain

What makes Linda Parker Hudson different from the rest of us is that she sees every challenge as a problem to be solved, and is confident she can solve it.

FORBES: Linda Hudson, First Female CEO In Defense, Reflects On What It Takes