They felt very much disappointed as they had been researching for three years but with no result.
做了三年的研究而没有任何结果，他们感到很失望。
They felt very much disappointed as they had been researching for three years but with no result.
做了三年的研讨而没有不论什么最后结果，它们觉得很失望。
They felt very much disappointed as they had been researching for three years but with no result.
做了三年的研讨而没有不论什么最后结果，它们觉得很失望。
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