影片中，有一段说的是钱在交通大学念书时的一次测验， 教他们的金老师每次总要给一个困难 ( a very tough problem ),聊天室女主播，目标是让门生警戒骄傲情感(not to be self-satisfactory)。
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This is a very tough problem space to solve, but the RAMCloud project is focused on just that, combining scale with very low access latency.
这是个非常棘手的难题，但RAMCloud项目仅仅关注于这一点，将可伸缩性与非常低的访问延迟组合到了一起。
It is kind of you to help us handle this tough problem in your spare time because it is very difficult for us to think of a means as feasible as yours.
你能在业余时间帮助我们解决这个棘手的问题真是太好了，因为我们很难想到和你一样行之有效的办法。
The slagging problem with coal-fired furnace is very common, which is now a tough problem to ensure boilers to operate safely and economically.
煤粉炉结渣问题普遍存在，是目前危机锅炉安全经济运行的一大难题。
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