The rounder, flatter shape of crabs lets crabs walk, run, swim and burrow more efficiently.

螃蟹更圆、更扁平的形状让螃蟹更有效地行走、奔跑、游泳和挖洞。

Sometimes I know, like, " He's gonna love that shell! " RACHAEL: Then one day Mary saw one of her crabs walking funny.

有时我知道，“他会喜欢那个贝壳的！”瑞秋：有一天，玛丽看到她的一只螃蟹走路很奇怪。