病人的结论是值得人警惕的，说明了手术对比其他治疗方法是没有优势的。
That patient crossover makes drawing conclusions tricky and may account for surgery showing no superiority over other treatments, Weinstein said.
那些抱着积极期望的人对比抱着消极期望的人，更容易找到搭档、更快地在手术后恢复、考试考得更好。
People who had positive expectations about finding a partner, recovering quickly from surgery and passing an exam, did better than those whose expectations were negative.
与之对比，心律转换器的发电器替换手术更加简单些，只需在胸腔上开个小口，引发并发症的几率仅有百分之一。
Replacing the generator, by contrast, is relatively straightforward, involving a small incision in the chest, and carries only a 1% risk of complications.
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