N a crab, esp of the edible species Cancer pagurus, that has not recently moulted and therefore has a hard shell 甲壳蟹 → compare soft-shell crab
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。
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