Crab sheds its hard shell, its exoskeleton, it has to wait about a week for the new.
当一只青蟹褪掉了它的硬壳(也就是它的外骨骼)之后，新长出的壳要等上大概一个星期才能变硬。
The reason is not the crab, is the hard work.
原因不在螃蟹，而是艰苦的工作。
PS: Crab fishing is a truely hard work.
逮螃蟹真实一件苦差事。
The hermit crab, barnacle, clam and snail have hard shells to protect themselves.
寄居蟹，藤壶，蚬和螺有很硬的壳来保护自己。
The hermit crab, barnacle, clam and snail have hard shells to protect themselves.
寄居蟹，藤壶，蚬和螺有很硬的壳来保护自己。
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