In terms of the structure of their exoskeleton, crabs can be divided into six types. If one is fully familiar with their skeletal structure, then after dismantling and treating the shell one can "click" the parts back into position so that the "joins" are barely visible.
從結構上看，螃蟹可以分六類，對牠們骨架的接合若能瞭若指掌，就可以在拆除處理後原封不動「卡」回去，完全看不出破綻。