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.
通过热处理前后残余应力测量结果的对比可以看出，使用该设备不仅提高了热处理质量和工效，而且减少了环境污染。
Through measuring and comparing of the residual stresses be fore and after treatment, it is result in raising the quality and effect of treatment and reducing the environment pollution.
然后笔者用内容分析法对比策略使用前后文本交互情况的变化，从而判断策略模型的有效性。
The author then used the content analysis to compare with the text, and thus judged the efficiency of the model.
通过热处理前后残余应力测量结果的对比可以看出，使用该设备不仅提高了热处理质量和工效，而且减少了环境污染。
Through measuring and comparing of the residual stresses be fore and after treatment, it is result in raising the quality and effect of treatment and reducing the environment po…
通过热处理前后残余应力测量结果的对比可以看出，使用该设备不仅提高了热处理质量和工效，而且减少了环境污染。
Through measuring and comparing of the residual stresses be fore and after treatment, it is result in raising the quality and effect of treatment and reducing the environment po…
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