| 单词 | superposition | 
| 释义 | superpositionsuperposition /ˌsupɚpəˈzɪʃən/ noun 1[uncountable] the placement of one thing on top of another2earth science the principle of superposition a scientific rule about the way rock is formed, which states that when sedimentary rock is formed in layers, the bottom layer is the oldest  | 
	
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