The United States calls for some countries to research the bionics since 1960. Bionicists do research on the unique quality of

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问题 The United States calls for some countries to research the bionics since 1960.
Bionicists do research on the unique quality of owls’ sensitive heating and engage in designing ______.

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答案sensitive mechanic ears for listening to enemy sonar

解析 文章第十四段最后一句话指出"…those engaged in designing sensitive mechanic ears for listening to enemy sonar…"设计敏感性听觉系统探测敌人的声呐装置,由此可知此处该填sensitive mechanic ears for listening to enemy sonar。
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