a mass of cloud

This can create a brightening on the sun called a flare, and is also often accompanied by the release of a cloud of plasma called a coronal mass ejection (CME).

它能在太阳上形成一个亮点称为耀斑，也经常伴随着等离子云的释放，称为日冕物质抛射(CME)。

Finally comes a coronal mass ejection, or CME, a slower moving cloud of charged particles that can take several days to reach Earth's atmosphere.

最后是日冕物质抛射，或是CME，一阵雨携带带电粒子云可在几天内到达地球大气。

Small white sails beat downriver under a threatening mass of indigo cloud, and out at sea the great high-sided bulk of a passenger ferry is dazzlingly illuminated in a sudden shaft of sunlight.

点点白帆迎着大团紫黑色的雨云顺流疾驰，忽而一道阳光透过云层，在跨海渡船高高的船帮上反射出眩目的光亮。