And then " buckler" meaning a small shield, which you don't have.

而" 当" 原意是指一个小手盾，可是你没有。

The buffoon hit the bull's-eye of the buckler.

小丑攻击圆盾的靶心。

The bulbul finally budged, and protected himself with a bulletproof buckler.

最终田园诗人移动起来，用一面防弹的小圆盾来保护自己。