一股热气从山顶源源没有竭降起。
跑起来，腿确是不似先前了，可是一股热气支撑着全身，他拚了命！
Though his legs were not as strong as before, buoyed up by elation he put his whole heart into running.
最终的结果是一股持续的气体流，开始是星系间的热气体，结束时是一股被称为“冷却流”的少量冷气体，落入星系中央。
The net result is a continuous flow of gas, starting as hot gases in intergalactic space and ending as a drizzle of cool gas called a "cooling flow," falling into the central galaxy.
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