The answer to the first question is that carbon dioxide is still found in abundance on Earth, but now, instead of being in the form of atmospheric carbon dioxide, it is either dissolved in the oceans or chemically bound into carbonate rocks, such as the limestone and marble that formed in the oceans. ( TPO41, 53)

　　abundance /?'b?nd(?)ns/ n. 丰富，充裕

　　atmospheric /ætm?s'fer?k/ adj. 大气的

　　dissolve /d?'z?lv/ v. 溶解

　　limestone /?la?m?st??n/ n. 石灰石

　　marble /'mɑ?b(?)l/ n. 大理石

　　大家自己先读，不回读，看一遍是否能理解

　　The answer to the first question is ( that carbon dioxide is still found in abundance on Earth), but now, (instead of being in the form of atmospheric carbon dioxide), it is either dissolved in the oceans or chemically bound into carbonate rocks, (such as the limestone and marble) (that formed in the oceans.) ( TPO41, 53)

　　托福阅读长难句100句分析：

　　这个句子的主干是：

　　The answer to the first question is 从句 , but now, it is either dissolved in the oceans or chemically bound into carbonate rocks

　　修饰一：(that carbon dioxide is still found in abundance on Earth) ，从句

　　中文：在地球上二氧化碳依然可以大量被找到

　　修饰二：(instead of being in the form of atmospheric carbon dioxide) ，介词短语

　　中文：它不是以大气中的二氧化碳的形式出现

　　修饰三：(such as the limestone and marble that formed in the oceans.) ，介词短语

　　中文：例如在海洋中形成的石灰石和大理石

　　修饰四：(that formed in the oceans.) ，从句

　　中文：在海洋中形成的

　　托福阅读长难句100句参考翻译：

　　第一个问题的答案是，在地球上二氧化碳依然可以大量被找到，但是现在，它不是以大气中的二氧化碳的形式出现，它溶解在海洋里或者通过化学作用进入碳酸盐岩中，例如在海洋中形成的石灰石和大理石。

　　这个句子的主要修饰成分就是从句和介词短语，大家务必想清楚，每一个修饰成分修饰的是什么，才能看清楚这个句子的结构。