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，排气阀打开，活移，它迫使燃烧过的气体从排气管下进入大气。

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

美国航天局表示，移发射装置控制核心级排气阀的面板出现了问题。

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

排气阀通冷，冷 汽冷却并返回水中。

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

新鲜水在发机内循环，用于冷却气缸套、气缸盖、排气阀和涡轮增压。

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

然后进气阀关闭，打开 排气阀。