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It looked as if someone had cut a patch out of the air,about

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It looked as if someone had cut a patch out of the air,about two meters from the edge of the road ,a patch roughly square in shape and less than a meter across.请详细分析句子成分,这里的about two meters from the edge of the road 是作定语吗?为什么用逗号?这里的a patch roughly square in shape and less than a meter across是什么成分?同位语?为什么roughly这个副词可以放在square形容词前,为什么没有谓语?
It looked as if someone had cut a patch out of the air,about
patch 与周围不同的小块,小片.a black dog with a white patch on its back,背上有一块白斑的小狗;a bald patch on the top of his head,他头顶的秃块;damp patches on the wall,墙上的片片湿渍;
It looked as if someone had cut a patch out of the air:看起来就像在空中被谁挖走了一小块;
这里的about two meters from the edge of the road 是作状语,并不是用来修饰和限定air的定语从句,之所以用逗号隔开,一来是作 a patch roughly square in shape and less than a meter across这句话的状语,用来修饰,强调这个状态发生在离马路两米远的地方;二来about two meters from the edge of the road 并不是用来修饰前面的It looked as if someone had cut a patch out of the air,而是修饰后面的a patch roughly square in shape and less than a meter across:在离马路边两米远的地方,有一小块不到一米宽的粗略的正方形;
a patch roughly square in shape and less than a meter across:不到一米宽,有一小块粗略的正方形.这里的roughly作为副词修饰形容词square,表示大致地,粗略地,不可以放在square前,如果放在square的后面则是作square的副词,因为square还可以作动词:使形成正方形,那么roughly放square后面的意思就是:粗略地形成了一个正方形,square在这后半句话又担任了谓语动词的角色,一句话中不能有两个谓语动词,否则与looked冲突.