Definition: the hot gas that is produced when water boils Level: B2
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.
在19世纪，许多机器由蒸汽操作。
In the 19th century, many machines were operated by ___steam.
博物馆的展览展出了一台可工作的蒸汽机模型。
The museum's exhibit features a working model of a ___steam engine.
