A2 [ C ] someone whose job is repairing the engines of vehicles and other machines技师；机工；机械师
Buying that second-hand car without having it checked by a mechanic first cost us dear.
At that time she was just a humble mechanic.
"Don't worry, your car will be ready tomorrow, " the mechanic assured him.
I applied for a job as a mechanic in a local garage, but I was rejected .
The mechanic pointed out the repair on the front of my car.
the way something works or happens例行方法，运作方式