游客们穿过古老的城门，首先看到的就是那座保存完好的瓮城。

Visitors first saw the well-preserved ___barbican when they passed through the ancient city gate.

古老的城堡入口处有一座坚固的碉楼，用来抵御入侵者。

A sturdy ___barbican stood at the entrance of the ancient castle to defend against invaders.