Before that period the city was a small highly compact cluster in which people moved about on foot and goods were conveyed by horse and cart.
在这之前，城市只是高度密集的小聚居群，在这里人们靠步行走动，商品靠马车运送。
One telltale sign is that black holes are often marked by a compact cluster of stars that surround them, which were pulled from the dwarf galaxy when the black hole escaped.
有证据说明，黑洞的明显标志就是它的周围经常有一群密集的恒星，这是因为黑洞从银河系逃脱的时候所造成的。
The cluster is so massive and so compact that its gravity bends and focuses the light from galaxies that lie behind it.
星系团如此紧凑、质量如此巨大，以致其重力扭曲和聚焦了它后面星系发出的光。
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