refractive index of medium的意思

a glass block of lenth 18cm and refractive index 1.5 contain List index out of bounds什么意思? be of medium build啥意思? of medium build 和 a medium build 的动词用法 be of medium build的同意句 body mass index 的中文意思 medium它的中文意思是什么 She is of medium height and has long hair 意思 she is of medium height 和 she is medium height 的区别.she is of he is of medium build 与he is medium build有什么不一样的地方? index具体函数意思? medium 什么意思