Theoretical research and practice prove that business groups have synergetic economic effect.
理论研究和实践均证实了企业集团具有协同经济效应。
Waste and old materials as renewable resources has been ignored for a long time, and its theoretical research and practice is also treated coldly.
作为再生商品资源的废旧物资及其广阔的市场，长期以来一直被严肃而谨慎的理论界所不耻，其理论研究和实践备受冷落。
Public policy evaluation is an important link of public policy processes but a weak link of public policy theoretical research and practice in our country.
公共政策评估是公共政策过程的重要环节，也是我国公共政策理论研究和实践应用的一个薄弱环节。
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