Last step, exhaust valve opens, piston travels up, it forces that spent burnt gases out your exhaust pipe, out into the atmosphere.

最后一步，气阀打开，活塞上移动，它迫使燃烧过的气体从气管入大气。

Then the intake valve closes, and an exhaust valve opens.

然后气阀关闭，打开 气阀。

The exhaust valve leads to a condenser, which cools the steam back into water.

气阀通冷凝，冷凝 冷却并返回水中。

The U.S. space agency says it encountered an issue with a panel on the mobile launcher that controls the core stage vent valve.

美国航天局表示，移动发射装置上控制核心级气阀的面板出现了问题。

The fresh water is circulated through the engine to cool the cylinder jackets, cylinder heads, exhaust valves and turbo-blowers.

新鲜水在发动机内循环，用于冷却气缸套、气缸盖、气阀和涡轮增压。