该历史街区的关键特色是其鹅卵石街道。

The key ___feature of the historic district is its cobblestone streets.

这款笔记本电脑拥有一个独特特色：用于安全的指纹扫描仪。

This laptop boasts a unique ___feature: a fingerprint scanner for security.

这个应用程序最好的特点是其易于导航。

The app's best ___feature is how easy it is to navigate.