He recognized through extensive research that effective communication in any language depends on mastery of a relatively limited number of words.

通过广泛的调查，他认识到任何语言的有效交流都依赖于掌握一定数量的相关单词。

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Although present knowledge of nutrition is not complete, a considerable amount of information already has been acquired through extensive research efforts in the field.

尽管目前的营养知识并不完全，但通过深入研究，在此领域已经获得了相当大量的知识。

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For a stable and reliable use of OPGW in the heavy ice areas, the power consumers, design institutes and OPGW manufacturers are paying much attention to it and are carrying through extensive research.

为了使OPGW光缆在重冰区线路上稳定可靠应用，电力用户、设计院及OPGW制造企业对此非常关注，并进行了广泛的研究。

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Having the National Academy of Sciences, which is a pre-eminent source of scientific research and review, sort through the extensive research that already exists, and identify what still needs to be done, will give us a better handle on how to address the rising aggressive behavior among our kids.

FORBES: Senator Rockefeller Quotes Experience, Believes That Evidence Proves Violent Movies and Games Cause Aggressive Behavior in Kids

My first exposure to seasonal analysis was in the early 1990s through Steve Moore of the Moore Research Center, which provides extensive research into seasonal trends and how they can be used to trade commodity spreads.

FORBES: The Four Key Seasonal Trends for 2012