铜屋顶经过几十年的风吹雨打，表面形成了一层漂亮的绿锈。

The copper roof has developed a lovely green ___patina after decades of exposure to the elements.

这座古老的小镇散发着一种历史的韵味，让人流连忘返。

The ancient town has a ___patina of history that makes it unforgettable.