The science that treats of forces and their effects in production and changing motion.

机械学；力学。

Application of this science to machines.

力学原理于机器上的应用。

The design, construction, operation of machinery or mechanical structures.

机器构造；机械运作。

Routine procedures, as the mechanics of the presidency.

例常事务或程序(如总统的例常事务)。