Neither piece of research is the last word, and neither discounts the long-term effectiveness of economic growth in improving working conditions.
这两篇研究报告都不是定论，而且都没有考虑经济增长对改善工作环境的长期效果。
There is now substantial research showing that aid is productive in countries with good policies and institutions, and those policies and institutions have recently been improving.
目前已有大量的研究结果显示，对于那些拥有良好政策和体制的国家，以及那些最近对政策和体制进行了完善的国家， 援助是富有成效的。
The research in Yuval's laboratory at the Department of Entomology focuses on improving this technique, as applied to fruit flies and mosquitoes.
这项在尤瓦教授位于昆虫系(Departmentof Entomology)的实验室里进行的研究关注于如何改进这项技术，并应用到果蝇和蚊子上。
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