scabbard

名词 scabbard:

1. a sheath for a sword or dagger or bayonet

1. The scabbard is content to be dull when it protects the keenness of the sword.
   刀鞘保护刀的锋利，它自己则满足于它的迟钝。
2. He made a very beautiful scabbard for his knife.
   他为他的刀做了一个漂亮的鞘。