The core of a steam engine is a cylinder that is sealed at one end and has a moving piston at the other.
蒸汽机的核心是汽缸。它一端密封，另一端有个可以移动的活塞。
However carefully boiler casings and steam pipes are sealed some heat escapes and is lost.
锅炉壳体和蒸汽管无论怎样仔细密封，总有一些热泄出耗失。 收藏。
4, Some heat escapes and is lost, however carefully boiler casings and steam pipes are sealed.
无论锅炉的壳体和蒸汽管怎样仔细地密封，总有一些热要漏出来，损失掉。
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