平时,我们是看不见这些物质的,但是,我们通过星云这个背景可以看见它的一部分,它就像是一条长长的灰尘组成的细线,或者是一个一个很小的椭圆形的结。
Normally this material is invisible, but some of it can be seen in silhouette against the nebular background, as long dust lanes and a small, dark, elliptical-shaped knot.
平时,我们是看不见这些物质的,但是,我们通过星云这个背景可以看见它的一部分,它就像是一条长长的灰尘组成的细线,或者是一个一个很小的椭圆形的结。
Normally this material is invisible, but some of it can be seen in silhouette against the nebular background, as long dust lanes and a small, dark, elliptical-shaped knot.
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