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

磷脂是神轴突周围的保护性鞘膜，能快速传导神冲动。

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.

它们缩回到保护性鞘膜内时不受到损坏，不过当拟狮要使用它们时，它们探出来，像弹簧折刀一样，还能切开猎物。