He is a master engineer.

他是个熟练的工程师。

youdao

W. Roebling III, a descendant of master engineer John A. Roebling, who is famous for designing and building the Brooklyn Bridge.

FORBES: Magazine Article

The Gilbert Institute of Erector Engineering proved an especially crafty ploy: Boys coveting the title "Master Engineer" first had to peddle ten Erector Tips subscriptions and, at Christmas, demonstrate Erector Sets in stores.

FORBES: Boy Toy

The Gilbert Institute of Erector Engineering proved an especially crafty ploy: Boys coveting the title "Master Engineer" first had to peddle ten subscriptions to Erector Tips and, at Christmas, demonstrate Erector Sets in stores.

FORBES: Magazine Article