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以上来源于: WordNet
It's impossible to say hello without smiling. One leads to the other just as a tap causes a knee jerk.
说“你好”的时候,是不可能不面带微笑的,而且能一个传给另一个,正如敲击膝盖引起的条件反射。
It was a knee-jerk reaction on her part.
这是她未加思索做出的反应。
The knee-jerk reaction to this is to call for proper security in all hospitals.
对此类状况的第一反应是要求所有医院都采取相应的安全措施。
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