卡那封这座威尔士小镇因其保存完好的中世纪城堡而闻名。

The town of ___Caernarfon in Wales is famous for its well-preserved medieval castle.

卡那封城堡是威尔士最著名的中世纪建筑之一。

___Caernarfon Castle is one of the most famous medieval buildings in Wales.