Based on several years water shutoff practice, current water shutoff methods and blocking agents needs to be improved.

根据几年来的堵水实践，目前的堵水方式和堵剂还须进一步完善、提高。

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Based on several years of experience evaluating custom Notes applications to diagnose performance-related issues, we've compiled the most common properties that can affect application performance.

根据我们数年来通过评测常规Notes应用程序来诊断与性能相关问题的经验，我们收集了对应用程序性能会产生影响的一些最常见的属性。

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Based on several years investigation, the list of 90 injurious plants which distributed in Zhejiang Province including the adventitious species and the indigene species was arranged in this paper.

在多年调查的基础上，列出了浙江省有分布的90种有害植物名录，包括外来有害植物和土著有害植物。

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So I wrote a little program called "chart" that, based on some data I happened to hardcode into the program, shows us their numbers for the past several years.

我写了一个叫做“图表“的小程序，基于我在程序中硬编码的一些数据，向我们显示在过去几年中我们课程的人数。

哈佛公开课 - 计算机科学课程节选

He says X Prize has refined its prize rules over several years based on his study of historical prizes, such as the 1714 prize the British government awarded for an instrument to measure longitude.

WSJ: Prizes Abound but Unclear if They Are Best Way to Get Innovation

As it turns out, even keeping people on antidepressants nonstop for two years is nearly impossible, based on several studies that have tried to accomplish this.

CNN: What are antidepressants' long-term effects?

After their relentless run, American stockmarket prices are now based on the assumption of juicy earnings growth for several years into the future.

ECONOMIST: The storm before the storm?