The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet. 独立主格成分:its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet. 主语+ -ed +介词短语。 在这里,and 是连接两个-ed 动词并列,每个-ed动词又分别带了一个with 介词短语, 把插入语"either cedar or pine" 去掉就看的很清楚了。 |