Related to sea slugs, nudibranchs are shell-less mollusks that display some of the most vibrant colors found anywhere in nature.
海兔和海蛞蝓是近亲，本身是一种无壳的软体动物，其身体能发出存在于自然界中大多数颜色鲜亮的光芒。
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Many cultures consider unusual eggs--misshapen, empty, yolkless, shell-less, or ones with the yolk and white merged--to be laid not by hens but by roosters.
OBJECTIVE:To use the shell-less hen's egg test chorioallantoic membrane as alternative methods to test the skin irritation hazard of some sunscreen cosmetics.