齿轮箱顶的设计获得了更多的功能。
而当你又注水进水箱的时候，漫过箱顶的水就从这个溢水管溢出。
And, when you fill the tank again, water will reach the top of the tank and overflow through this vent pipe.
这个装置有助于排除液氧燃料箱蒸发的气体，并且它还可以用加温氮气笼罩箱顶，以防结冰。
This device helps vent gas that boils off from the liquid oxygen tank, and also bathes the top of the tank in warmed nitrogen to prevent ice from forming.
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