exhaust gas composition

例句：

1. 1.The exhaust gas composition is crucial for the engine's performance.
   排气气体组成对发动机的性能至关重要。
2. 2.The exhaust gas composition analysis helps in identifying the source of pollution.
   排气气体组成分析有助于识别污染源。
3. 3. The exhaust gas composition can be used to measure the efficiency of the combustion process.
   排气气体组成可以用来测量燃烧过程的效率。