He is a long-distance runner.

他是一个长跑选手。

She excels as a long-distance runner.

她是个出色的长跑运动员。

I am a long-distance runner, not a sprinter.

我是长跑运动员，不是短跑运动员。

He is a very good middle and long distance runner.

他是非常优秀的中长跑运动员。

That long distance runner soon pulled up with the others.

那位长跑运动员很快赶上了其他人。