| 词汇 | refractive index | 
| 释义 | refractive index  noun [ C ]  physics specialized uk/rɪˌfræk.tɪv ˈɪn.deks/ us/rɪˌfræk.tɪv ˈɪn.deks/  折射率 a measure of how much a particular substance refracts light | 
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