1969年，美国一侧的瀑布被断流以研究瀑布底部的岩石堆积。

The American side of the falls were shut off in 1969 to study the buildup of rock at the base of the falls.

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每一组大约十来名学生，由一位经验丰富的导游带领，将进行为期十天的登山露营，以研究在那里生长和生活的动植物。

Groups of about a dozen students each, led by an experienced guide, will go on ten-day camping trips to the mountains to study the plants and animals that grow and live there.

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尽管我以研究习惯养成技术为生，但断网对我来说并不容易。

Even though I study habit-forming technology for a living, disconnecting is not easy for me.

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So there are some element of the research that Looks at technology that can help students in different ways.

有一些研究的方面,是研究技术能够以,不同的方式帮助学生。

麻省理工公开课 - 媒体、教育、市场课程节选

So one thing you will quickly note is that there are no permanent answers in a study of political philosophy.

有一件你们会马上注意到的事,就是没有永恒的答案,可用以研究政治哲学。

耶鲁公开课 - 政治哲学导论课程节选

You want to give it to people in different communities, to make sure that it works in all the subpopulations where the vaccine's potentially valuable.

研究者希望将疫苗分接种于不同人群,以确保疫苗适用于所有人,这样才能体现疫苗的价值

耶鲁公开课 - 生物医学工程探索课程节选