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。
2
This robust encoder features a double sealed housing that allows the encoder to be operated in regulatory washdown and high pressure steam or caustic chemicals environments.
这一功能强大的编码器采用了双重密封的房屋，允许编码器将在监管冲洗高压蒸汽或环境腐蚀性化学品的经营。
3
However carefully boiler casings and steam pipes are sealed some heat escapes and is lost.