试验研究中不可缺少的三项内容分别是试验因素、受试对象和试验效应，通常将他们称为试验设计的三要素。
The three indispensable terms in an experimental research are: experimental factors, subjects, and experimental effects, which are generally called three principles of an experiment design.
根据其他研究团队既往的试验，该小组认识到超声波可对组织产生物理效应。
The team knew from experiments done by other groups of researchers that ultrasound can have a physical effect on tissue.
现对来说，曼彻斯特，将会是”一个试验这种社会效应的好地方“。
Manchester, by contrast, would be “a good place in which to test social impact”.
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