经济发达的国家在过去或现在都面临如何解决居民住房的问题，他们通过几十年的努力积累了大量宝贵的经验。
In the past or now, the west countries also face how to resolve the problem of residents' housing. Passed the diligent backlog of several decades, they got much precious experience.
雷诺和艾哈迈德通过几十年来对大量数据的研究，努力避免这些错误。
Messrs Raynor and Ahmed work hard to avoid these mistakes by studying large bodies of date over several decades.
经过几十年的不解努力，公司已初具规模，并通过ISO 9001： 2000质量管理体系认证。
After decades of puzzling efforts, the company has begun to take shape, and passed ISO9001:2000 quality management system certification.
经过几十年的不解努力，公司已初具规模，并通过ISO 9001： 2000质量管理体系认证。
After decades of puzzling efforts, the company has begun to take shape, and passed ISO9001:2000 quality management system certification.
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