The idea was to use PET scans combined with recently available chemicals that reveal endorphins in the brain, to compare runners’ brains before and after a long run.

研究使用PET扫描仪将跑步者长跑前后的大脑进行对比，扫描仪中有能够用于显示大脑中内啡肽的化学物质。

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Objective To compare the quality of life in depressed outpatients with anti - depressant before and after treatment.

目的研究门诊抑郁症患者的生命质量及其抗抑郁治疗后生命质量的疗效。

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Objective: To study the conditions and parameters of purifying total flavonoids from L. dunnii with AB-8 macroporous resin and to compare with antioxidant ability before and after being purified.

目的：研究AB-8型大孔吸附树脂纯化春花胡枝子总黄酮的条件、参数及纯化前后体外抗氧化能力的变化。

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Compare after 30 or 60 seconds with the person next to you and see if before I reveal the answer we can't get everyone on to the exact same page.

和你身边的人比较30到60秒钟,看看是否在我揭露答案之前，我们不能使每个人,得到一个完全相同的页面。

哈佛公开课 - 计算机科学课程节选