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

然后进气关闭，打开 排气。

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

排气通向冷凝器，冷凝器 蒸汽冷却并返回水中。

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，排气打开，活塞向上移动，它迫使燃烧过的气体从排气管向下进入大气。

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

航天局表示，移动发射装置上控制核心级排气的面板出现了问题。

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、排气和涡轮增压器。