蒸气

例句：

1. 1. The hotair rises and turns into steam.
   热空气上升变成蒸汽。
2. 2. Steam is a commonform of energy in many industries.
   蒸汽是许多工业中常见的能源形式。
3. 3. The steamengine was invented to power machines.
   蒸汽机被发明用来驱动机器。