这个应用程序的界面设计得非常实用，所有按钮都按照使用频率排列。

The app's interface is ___functionally designed with all buttons arranged by usage frequency.

这台洗衣机外表有点旧，但还能正常运转。

The washing machine looks old, but it still works ___functionally well.

这把椅子设计简约但非常实用，坐着很舒服。

This chair is simple in design but ___functionally excellent, very comfortable to sit on.