起初，这个复杂问题使他们感到灰心丧气，但经过仔细思考他们终于研究出了解决办法。
At first this complicated problem frustrated them, but after thinking it over carefully they finally worked out a solution.
我自己的缺点及周围人的缺点使我感到灰心并使我失明。
I have been blinded by frustration with my own shortcomings and those of the people around me.
起初，这个复杂问题使他们感到灰心丧气，但经过仔细思考他们终于研究出了解决办法。
At first this complicated problem frustrated them but after thinking it over carefully they finally worked out a solution.
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