在线等，一道语法题，实在看不懂啊，OG68道

aibaobao288

the first trenches that were cut into a 500-acre site at TH, S , have yield strong evidence for centrally administered complex societies in northern regions of the middle east that were arising simultaneously with but independently of the more celebrated city-states of southern M, in what is now called Iraq

可以给解释一下吗？实在看不懂啊