她曾是律师，但后来完全改变了职业方向，成为医生。

She was a lawyer, but then she changed ___track completely and became a doctor.

在金融行业工作多年后，他决定转换方向，进入非营利领域。

After years in finance, he decided to switch ___track and enter the nonprofit sector.

该项目允许学生根据兴趣定制自己的学术发展方向。

The program allows students to customize their academic ___track based on their interests.