Because, you know how we just said that Joules are the units of work?
因为，你还记得我们说过 就在不久前，焦耳用作工作焦耳？
星火专八听力【综合演练 20+8 篇】
EFL teachers use stories to supplement their core materials or to create self-contained units of work that constitute mini-syllabuses.
英语教师使用故事来补充他们的核心材料，或创建独立的工作单元，构成迷你教学大纲。
英语百科
Database transaction
A transaction symbolizes a unit of work performed within a database management system (or similar system) against a database, and treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in database. Transactions in a database environment have two main purposes: