One who is skilled in the principles or practice of any branch of mechanical science.

机械师；工程师。

One who has charge of and manages an engine or a locomotive.

司机。

One of a group trained in building bridges, roads, etc., for military use.

(军队中之)工兵。

One who carries through a scheme or undertaking.

执行者；监督。

To plan, lay out, or direct.

设计；计划；指导。

To contrive; maneuver.

图谋；策划；操纵。