她已经取得资格以专业选手身份参赛。

She has qualified to compete as a ___professional.

业余爱好者要成为专业选手需要多年的练习。

It takes years of practice for an amateur to become a ___professional.

他在赢得全国冠军后转为职业选手。

He turned ___professional after winning the national championship.