小壳 meaning in English

okara

Seven populations of cathaica cavimargo were separated into two groups , one containing large - shelled populations in open sunlit habitats with many boulders . the other contained small - shelled populations in shaded hillside habitats and on rock surfaces . this process revealed strong correlation between the variation of shell biometric characters and the microenvironment
一组为具大壳的分布有大块石灰石或花岗石的敞开环境： 0号、 5号和6号样地种群；另一组为具小壳的山腰隐蔽环境及岩石： 1号、 2号、 3号和8号样地种群。