One of the essential, functioning parts of a subsystem or equipment, possibly a self-contained element, or a combination of parts, assemblies, attachments, or accessories.
子系统或设备的基本组成部分或功能部件之中的一个。它可以是一种独立的元件, 也可以是若干部件、装配件或附件的组合。
Having no attachments or ties; free to do as one pleases.
自由自在的无任何束缚或牵连的; 任意做自己喜欢的事的
It's an electric drill with a range of different attachments.
这是一个带有各种配件的电钻。
