这次研究并不能证明什么疗效，因参与者们只被评估了一次而不是多次反复地被评估，他说到。
The study can't prove an effect because the participants were evaluated only once rather than repeatedly over time, he said.
“我们的工程师们已经反复多次测试过这支广告，去除了所有的程序错误，我们可以骄傲地对这支广告的软件质量打保票，”麦臣女士发誓说。
"Our engineers have repeatedly tested this commercial to work out all the bugs, and we proudly stand behind this advertisement," Machen said.
过去几周时间里，我不停地把这些观念反复想了很多次。
Over the past few weeks, I've found myself thinking of this notion again and again. He writes.
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