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。
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.
每一只不起眼的抽屉也是美丽的；前后左右四个面用燕尾榫依次连接，前面和两侧分别使用差别明显的木料，以造成对比的效果：浅色橡木可以配紫檀木，桃花心木可以配白蜡木。
Each humble drawer, too, was beautiful, with sides and front in deliberately contrasting woods linked by dovetails: light oak into rosewood, mahogany into ash.
介绍了改进后供胶装置的结构及工作原理，并对改进前后的使用效果进行了对比。
The glue applicator was improved. The structure and principle were introduced, and the performance before and after improvement was compared.
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