running theory

• 工作原理

running theory的用法和样例：

例句

1. Know about inner combustion engine principle and mechanical theory.
   了解内燃机工作原理和机械原理。
2. The paper introduced the working theory and the technology character of pulse-packs dust-catcher.
   介绍了脉冲袋式除尘器的工作原理及技术特点。