Since the sea covers the greater part of the earth's surface, it is quite reasonable to regard the sea floor as the basic form of the crust of the earth, with, superimposed upon, it the continents, together with the islands and other features of the oceans.
参考译文:既然海洋覆盖着地球的大部分表面,因此完全有理由把海床看作地壳的基本模壳,上面附加着大陆以及岛屿和海洋的其他形态。
解析上是这样说的:it是先行主语,真正的主语是动词不定式to regard the sea floor as earth。 with, superimposed upon it, the continents,together with... oceans是由介词with引导的过去分词独立主格结构。其逻辑主语是the continents,togetherwith...oceans,由于该逻辑主语太长,所以将逻辑谓语部分superimposed upon it提前,构成倒装语序,意即“上面附加着大陆以及岛屿和海洋的其他形态”。
问题:学生没搞懂为什么with前后都要加逗号(句子来源于新概念第30课)
原句upon后的逗号有误,应该在it后,with后的这部分相当于:with the continents, together with the islands and other features of the oceans, superimposed on it. 这里的superimposed 应该是过去分词。我理解with 前有逗号是因为句子较长需要停顿,这样句子成分也清晰,with 后的逗号是因为superimposed on it 前置所致。
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