基本解释珠蚌同根派生 英汉例句A comparative observation on glochidial morphology of two unionid species(unionidae) 蚌科两种蚌钩介幼虫形态的比较观察Morphological variations and discriminant analysis of five freshwater unionid species (Bivalvia: Unionidae) 五种蚌的形态变异与判别分析