middle distance
noun
1
the middle distance
the part of a real or painted landscape between the foreground and the background（景致或风景画前景和背景之间的）中景。
2
- usu. as modifier Athletics a race distance of between 800 and 5,000 metres【田径】（800-5,000米的）中距离跑：
middle-distance runners.
中距离跑运动员。