Methods Retrospective survey was conducted in 636 workers.

方法对636名接触工人作了回顾性调查。

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METHODS The main problems were found out by retrospective survey method, and could be solved through establishing a system of management.

方法采用回顾性总结的方法，找出问题，提出相应对策。

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Methods Retrospective survey and descriptive research analysis were made with annuals reports of infections diseases during 1984 and 2003 in Baoan District.

方法利用宝安区1984 ~ 2003年疫情汇编和宝安区统计局历年人口年鉴进行回顾性调查，并作描述性研究分析。

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"Bellows is waiting to be rediscovered, " says the National Gallery's Charles Brock, a curator of the retrospective, the first comprehensive survey of the artist's work in more than three decades.

WSJ: George Bellows at Washington's National Gallery of Art