Clearly, Alvin had a difficult problem to solve, but rather than being able to sense any forward progress, he was beaten down and made to feel incompetent.
很显然，Alvin面临着一个难题，但是在还没有体会到任何进步之前，他就已经被困难打倒而且我们可以感到他的无助和自卑。
Rather, he offered his engineers a difficult and interesting problem to solve, confident that someone would want to accept the challenge.
相反，他向他的工程师们提出了一个艰巨但颇为有趣的难题，并且坚信总会有人乐于接受这个挑战。
The Extension of fuzzy measures is a very important and rather difficult problem in fuzzy measure theory.
模糊测度的扩张是模糊测度论中一个非常重要和难度较大的课题。
The Extension of fuzzy measures is a very important and rather difficult problem in fuzzy measure theory.
模糊测度的扩张是模糊测度论中一个非常重要和难度较大的课题。
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