ejection opening

• 抛壳口

ejection opening的用法和样例：

例句

1. This allows the crab to insert a large toothlike appendage on its right-hand claw into the opening, thus cracking the snail's shell.
   这样就可以把它右爪那边象牙齿样的东西刺进蜗壳口从而弄碎蜗壳。