活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。
Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.
同时，加热表面上方还会出现由爆发沸腾向常规核态沸腾的过渡，通过转变时间这一特征参量能够对两种沸腾形态进行划分。
Besides, there is a changeover from explosive boiling state to conventional boiling state on the heating surface, and the transition can be denoted by changeover time.
研究了带有同心套管的垂直圆柱形加热表面在环隙中通入空气时的核沸腾传热性能。
Nucleate boiling heat transfer on a vertical cylindrical heated surface with a concentric outer tube was investigated when air was introduced into the boiling liquid.
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