steam admitted above the piston

例句：

1. 1. The engine produces a lot of steam when it runs.
   发动机运行时会产生很多蒸汽。
2. 2. The steam has been used to power the locomotive for many years.
   蒸汽已经用来驱动火车头多年了。
3. 3. The steam is rising from the boiler and filling the room with warmth.
   蒸汽从锅炉中升起，给房间带来温暖。