短語詞組短語rarer medium 光疏媒質(zhì)Need will be rarer 人人各取所需optically rarer medium 光疏介質(zhì)rarer essential element 微量養(yǎng)分元素Be Even Rarer 則更為罕見frequency the rarer allele pair 一對稀有等位基因的頻率 返回 rarer