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The second one is called Science on Tap.
VOA: special.2010.05.14
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If you tap somebody on the knee, your leg will jump out.
如果你轻击某人的膝盖,小腿就会弹出去
耶鲁公开课 - 心理学导论课程节选
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She uses both hands to finger-tap on the flat narrow part of the guitar called the fretboard.
VOA: special.2011.01.28