7 hr 30 min Even after operators pump water into the primary loop, pressure is still high. The PORV 'backup valve is opened to lower the pressure.
7小时30分钟尽管操作员已将水抽入主回路，但温度仍然很高。减压阀的备用阀门被打开，减少压力。
The upper master valve is used on a routine basis, with the lower master valve providing backup or contingency function in the event that the normal service valve is leaking and needs replacement.
上部总闸门用于日常运行，而下部总闸门用于在正常使用的闸门发生渗漏并需要更换的情况下提供备用或应急的功能。
There was nothing to fall back on so valvular surgery without an artificial valve - at least as a backup - was a very dangerous game to play.
所以，没有人造瓣膜的瓣膜手术是一个非常危险的游戏。
There was nothing to fall back on so valvular surgery without an artificial valve - at least as a backup - was a very dangerous game to play.
所以，没有人造瓣膜的瓣膜手术是一个非常危险的游戏。
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