incomplete combustion

例句：

1. 1. The engine was designed to burn fuel efficiently, but it still had some incomplete combustion issues.
   发动机设计用来高效燃烧燃料，但仍然有一些不完全燃烧的问题。
2. 2. During the firefighting operation, the team members noticed that there were areas of incompletecombustion in the debris.
   在灭火行动中，团队成员注意到了废墟中的不完全燃烧区域。
3. 3. To improve efficiency, the company is working on reducing incomplete combustion and increasing energy recovery systems.
   为了提高效率，该公司正在努力减少不完全燃烧并增加能源回收系统。