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　　It is not surprising, therefore, that the highest ratio of oil and gas pools to volume of sediment is found in rock no older than 2.5 million years—young enough so that little of the petroleum has leaked away—and that nearly 60 percent of all oil and gas discovered so far has been found in strata that formed in the last 65 million years. (TPO43, 65)

　　大家自己先读，不回读，看一遍是否能理解

　　托福阅读长难句剖析：

　　It is not surprising,therefore, (that the highest ratio of oil and gas pools to volume of sediment is found in rock no older than 2.5 million years)—young enough so that little of the petroleum has leaked away—and (that nearly 60 percent of all oil and gas discovered so far has been found in strata that formed in the last 65 million years). (TPO43, 65)

　　这个语句的结构：

　　It is not surprising that 从句 and that 从句

　　首要即是两个从句，然后中心有一个破折号离隔

　　润饰一：(that the highest ratio of oil and gas pools to volume of sediment is found in rock no older than 2.5 million years)，从句

　　中文：油藏和气藏的数量与沉积物总量的比率最高出现在年纪不超越250万年的岩石中

　　润饰二：(that nearly 60 percent of all oil and gas discovered so far has been found in strata that formed in the last 65million years)，从句

　　我们留意，能不能来了解这个从句中的discovered?先想想看。

　　本来，这个语句中还有一个非谓语动词润饰成分，that nearly 60 percent of all oil and gas (discoveredso far) has been found in strata that formed in the last 65 million years

　　中文：约60%的石油和天然气都被发现在曩昔650万年构成的岩层中

　　托福阅览长难句参阅翻译：

　　因此，毫无意外，油藏和气藏的数量与沉积物总量的比率最高出现在年纪不超越250万年的岩石中——岩石还很新，以至于很少的石油走漏——而目前为止发现的约60%的石油和天然气都被发现在曩昔650万年构成的岩层中。

　　这个语句的首要润饰成分即是从句和非谓语动词，我们必须想明白，每一个润饰成分润饰的是什么，才干看明白这个语句的结构。

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