内部下工夫

例句：

1. 1. The company's internal structure is complex.
   公司的内部结构很复杂。
2. 2. The engineer had to work on the internal system of the machine.
   工程师必须修理机器的内部系统。
3. 3. The team decided to move forward with the internal plan.
   团队决定按照内部计划前进。