1. Having chelae or resembling a chela. 
   有螯的或似螯的
2. small shrimp that makes a snapping noise with one of their enlarged chelae. 
   前脚能发出噼啪声的小虾。
3. The horseshoe crab is not a true crab. 
   鳖并非真正的蟹类
4. A crab moves sideways. 
   螃蟹横爬行.
5. Infestation by crab lice. 
   虱病由阴虱导致的感染

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