They're kept out of harm's way within these protective sheaths, but when he needs to use them, the Mega Lion would swing them into action, like switch-blade knives, and could slice up prey.

们缩回到保护性鞘膜内时不会受到损坏，不过当拟狮要使们时，就会把们探出来，就像弹簧折刀一样，还能切开猎。

Myelin is the protective sheath that surrounds the axons of neurons, allowing them to quickly send electrical impulses.

髓磷脂是轴突周围的保护性鞘膜，能快速传导冲动。