He is a professional athlete.

他是一名职业运动员。

If you become a professional athlete.

如果你变成了一个职业运动员。

Reasons for becoming a professional athlete.

赞成当运动员的理由。

He is over the hill as a professional athlete.

作为一名职业运动员，他的巅峰时期已过。

He is over the hill as a professional athlete.

作为职业运动员，他已在走下坡路了。