1. He has been an active participant in the discussion.
他一直积极参与这次讨论。
《牛津词典》
2. As an active participant in various volunteer work, I have a lot of experience in serving others.
作为一个积极参与各种志愿活动的人，我在服务他人方面有很多经验。
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3. In the past few years, Math Counts added two new middle school programs to try to diversify its participant pool.
在过去的几年里，MathCounts增加了两个新的中学项目，试图使其参与者多样化。
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4. For one trial, each participant was shown a pile of pens that the researcher claimed were from a previous experiment.
其中一项试验中，研究人员向每一位参与者展示了一堆笔，并声称这些笔来自先前的一项实验。
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5. He described one study participant, still working at the age of 100, who was recently disappointed to see his son retire.
他描述了一位100岁仍在工作的研究参与者，这名参与者最近因看到自己的儿子退休而感到失望。
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6. For the study, each participant watched a computer screen while images of common objects, like a mug or a pen, appeared on the screen.
在此项研究中，每一个参与者都要盯着电脑屏幕，一些像杯子或笔这种普通的物品出现在屏幕上。
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7. In the past few years, Math Counts added two new middle school programs to try to diversify its participant pool—the National Math Club and the Math Video Challenge.
