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in/over a period of …

双语例句

  1. In Norway, after an intervention campaign was introduced nationally, an evaluation of forty-two schools suggested that, over a two-year period, bullying was halved.
    在挪威，一项干预运动在全国推广后，对42所学校的评估表明，在两年的时间里，欺凌现象减少了一半。
  2. Williams and his colleagues sampled the blood of over 5,000 American Indians in western North America during a twenty-year period.
    在20年的时间内，威廉姆斯和他的同事对北美西部的5000多名美洲印第安人的血液进行了取样。
  3. But this is the result of dedicated work over a long period, particularly from the officers in charge of community development.
    但这是长期努力的结果，尤其要归功于负责社区发展的官员。