An atomic clock that operates with an ammonia molecule may be used to check the accuracy of predictions based on Einstein’s rela

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问题 An atomic clock that operates with an ammonia molecule may be used to check the accuracy of predictions based on Einstein’s relative theories.

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答案relative——relativity

解析 此处指爱因斯坦的相对论,应用名词relativity表示关于相对性的理论,而relative theory表示理论本身是相对的。
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