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
The complicated problem frustrated them at first, but after careful thought they finally worked out a solution
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
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