light shell造句

there was large interpopulation and intrapopulation variation in shell colour . in general, the distribution of the shell colours was not completely random . populations living in shaded places, characterized as dim and humid, had a high frequency of dark shells, while populations living in sunny and relatively dry, open places had lighter shells
尽管如此，分析结果表明贝壳颜色的分布并非完全随机，遵循一定的分布规律；在阴暗潮湿的隐蔽环境中生活的蜗牛贝壳颜色深，而在阳光充足，相对干燥的敞开环境中的蜗牛，却有浅色贝壳；与此同时，发现贝壳厚度同样随环境变化而变异。
It's difficult to find light shell in a sentence. 用light shell造句挺难的