steam

沸腾锅中的热蒸汽使我的眼镜蒙上了雾。

The hot ___steam from the boiling pot fogged up my glasses.

博物馆里的那台老旧机械是由蒸汽机驱动的。

The old machinery in the museum is powered by a ___steam engine.

在19世纪，许多机器由蒸汽操作。

In the 19th century, many machines were operated by ___steam.