a mechanical engineer的用法和样例：
- My father is a mechanical engineer.
- His evening study has equipped him for a career as a mechanical engineer.
- Robert Hocicaday,a mechanical engineer in New Mexico,thinks fuel cells could have even broader applications.
- My two degrees and my experience as a mechanical engineer make me the right person, for the position you advertised.
- The applicant Iqbal Ahmed Bhutto applied for permanent residence in Canada as a mechanical engineer.