照片的左上方是一个日珥，它是一个巨大的等离子体气体环，在这个时候正被抛离太阳。
At the top left of the image there is a solar prominence, a huge loop of plasma, that is being blasted into space.
日冕的电离气体（又叫等离子体）不仅非常炙热，而且异常稀薄，其密度还不到组成太阳主体的氢气密度的十亿分之一。
As well as being very hot, the ionised gas of the corona (called plasma) has a superthin consistency. It is less than a billionth of the density of the hydrogen that makes up the main ball of the Sun.
等离子体——一种有时被称为物质第四状态的电离气体——通常存在于上千摄氏度中，而热等离子体常常被用于外科手术器械的消毒。
Plasma — an ionized gas sometimes called the fourth state of matter — typically exists at thousands of degrees Celsius, and hot plasmas are regularly used to sterilizing surgical equipment.
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