• 1. extensive study: 广泛的调查 | 彻底研究 | 深入研究
• 2. extensive study is conducted: 进行了大量研究

• 1.She recently completed an extensive study of elected officials who began their political careers before the age of 35.
  她最近完成了一项对35岁前开始政治生涯的当选的官员的广泛研究。
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• 2.The nature of all kinds of membranes is a subject of extensive study.
  各种膜的性质是一个进行广泛研究的题目。
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• 3.In 1900 George Clinch published a new, extensive study in The Reliquary and Illustrated Archaeologist.
  1900年乔治·克林齐在期刊《圣物箱与插图考古学家》中发表了一项全新的深入研究。
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