dark band造句怎么写

a dark band in the spectrum of white light that has been transmitted through a substance that exhibits absorption at selective wavelengths.

The dark band across the image center is blocked by dust in the plane of our own Milky Way Galaxy.

Messier 64 (M64) has a spectacular dark band of absorbing dust in front of the galaxy's bright nucleus, giving rise to its nicknames of the "Black Eye" or "Evil Eye" galaxy.