for protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle
with roofs of poles and arrowweed that are
答案是原题中的划线部分,请大家解释一下为什么with 不行好吗?
each a roof of poles and arrowweed 是个(不定代词+名词)独立主格。
这个with+名词短语不知道做什么成分。
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