个人觉得这应该是 with 型独立主格,“with+宾语+宾补” ,在句中可作状语,表示伴随。这一结构中的宾语补足语可由现在分词、过去分词、形容词、副词或介词短语等来充当
with (more than 75 carefully engineered) structures, of up to 600 rooms each, connected by a complex regional system of roads
主干就是 structures connected by a complex regional system of roads
(of up to 600 rooms each是插入语)
-- by 会员 myungryong (2010/8/15 23:58:54)