极低的冰点和较高的沸点，对低温和过热的发动机提供良好的保护。
An extremely low freezing point and high boiling point, for low temperature and overheat engine provide good protection.
活动部件的摩擦使发动机过热。
Friction between moving parts had caused the engine to overheat.
当第谷·布拉赫号飞船周五越过热火- 1x号火箭发动机头顶，从波罗的海的一个平台上升空(如图)，私人太空飞行本周向前迈出了一大步。
Private spaceflight took one giant step forward this week when the Tycho Brahe craft lifted off atop the HEAT-1X rocket engine Friday (pictured) from a platform in the Baltic Sea.
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