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.
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 complex problem made them feel frustrated, but after careful consideration, they finally worked out a solution.
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.
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. After thinking it over and over, they finally worked out a solution.
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. After thinking it over and over, they finally worked out a solution.
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