7.Let's cut to the chase: the Milky Way galaxy is a vast, flat, disk-shaped collection of gas, dust, and stars — a sprawling megalopolis that's a mind-crushing 100,000 light years across and several thousand light years thick.
银河系是一个巨
的、扁平的、盘状的气体、尘埃和恒星的集合——一个庞
的
都市,直径达10万光年,厚达几千光年,令人叹为观止。
「Crash Course 天文篇」评价该例句:好评差评指正