unburned mixture的用法和样例：
例句
- For firing of the mixture in the cylinder every time spark occurs, the air-fuel ratio must lie in a fairly narrow range.
为了在气缸里每一时刻发生一次火花时混合气的燃烧更理想，空一燃混合比必须限于相当狭窄的区域内。 - Blowby is basically the leakage of compressed air-fuel mixture and burned gases past the piston rings into the crankase.
窜气，基本上是被压缩的空燃混合气和燃烧后的气体的泄漏，它通过活塞环进入曲轴箱。
