Astronomers have long thought that a black hole ought to be surrounded by a torus of dust and gas.
天文学家长期认为黑洞应该是由一环尘埃和气体包围着的。
The grayish structure surrounding the black hole, called a torus, is made up of gas and dust.
而图中环绕黑洞的灰色部分，被称为环体，它们由气体和星尘组成。
Cutting across a bright cavity of ionized gas, the dust torus surrounding the central star is in the upper right corner of this view, nearly edge-on to the line-of-sight.
这道几乎是侧对著我们的拱中心星尘埃环，位在这张影像的中左上方，斜切过一团明亮的游离云气。
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