Pace/配速 VS Speed/速度 概念不同，就像小布贴里另一个例子4.5英里/小时，这是速度/Speed

AI解释：

Pace is the time it takes to cover a set distance (e.g., minutes per mile), while speed is the distance covered in a set amount of time (e.g., miles per hour).

Pace measures efficiency (time/distance), whereas speed measures rate (distance/time).

Runners often use pace to track performance, while speed is used for vehicles.