n.

1. 力学；机械学[J]
   Mechanics is taught by Dr. Hill.

   力学由希尔博士教授。

2. 技术性的部分；技术；技巧[K]
   the mechanics of writing plays

   写剧本的技巧

pl. n.

1. [treated as sing.] the branch of applied mathematics concerned with motion and forces producing motion.
   ▸machinery as a subject.
2. the machinery or working parts of something.
   ▸the practicalities or details of something.