元素是特定的抽象级别上不可拆分的不透明实体。
An element is an opaque entity that is indivisible at a given level of abstraction.
原子性意味着要么所有事务操作都应用于应用程序状态，要么都不应用；事务是不可拆分的工作单元。
Atomicity means that either all of the transactions' operations are applied to the application state, or none of them are applied; the transaction is an indivisible unit of work.
拆分汽车衔铁循环利用唯一的获利方法就是用人工拆分；在美国，由于劳动力昂贵，干人工拆分这一行不可能。
The only profitable way to recycle a motor armature into its constituent parts is to "break it" manually; in the US, with its expensive labor, that's just not possible as a business proposition.
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