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.

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。

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The transmittance is central to the theory of radioactive cooling.

透过率是辐射冷却理论的中心。

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The effects of different casting speeds, degree of superheat and secondary cooling to the central and Angle part temperatures and the final solidification point have been studied.

研究了不同拉速、过热度及二冷比水量对铸坯表面中心和角部温度及铸坯凝固终点位置的影响。

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Heating and cooling experts say central air-conditioning systems should be serviced annually to remove dirt, change filters and check the level of Freon, a refrigerant.

WSJ: Don't Wait to Service AC Units