单词：refractive index of liquid
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口语学习：炎炎夏日，雨季来袭！隔三差五的雨水是否带给你阵阵的清爽，还是让你措手不及呢？英文里有不少和雨有关的习语，今天就来看看英文中的雨还有哪些表达吧！ 1. Feel right as rain
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