拳击运动员用拳头击打对手。
在一个实验里，Spaepen用拳头击打参与者的拳头，并要求他们回击同样的次数。
In one test, Spaepen would knock her fist against a study participant's fist a certain number of times and then ask them to respond with the same number of knocks.
“我们这么辛苦得抚养你，你却突然离开我我们，”一位妇女一边哭诉，一边用她的拳头击打聚源中学的废墟，“你走了，我们以后怎么办啊？”
"We worked so hard to raise you and then you left us so suddenly," a woman screamed, pounding the ruins of the Juyuan Middle School with her fists. "How could you leave us to grow old alone?"
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