steam and air mixture

例句：

1. 1.The scientist mixed the chemicals to create a new substance.
   科学家将化学物质混合以创造一种新的物质。
2. 2. The car's engine produces a steam and air mixture that powers the wheels.
   汽车的引擎产生一种蒸汽和空气混合物，为车轮提供动力。
3. 3. The scientists were trying to understand the mixture of gases in the atmosphere.
   科学家们试图理解大气中气体的混合物。