托福阅读长难句是困扰很多考生的问题，很多同学因为看不懂句子导致失分严重。下面前程百利小编给大家搜集了几个托福阅读长难句，并对每一个句子进行了精析，最后还有意群训练供大家练习和巩固。大家一起来看一下吧。
1. Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.
难句类型：复杂修饰+插入成分
本句的主句结构应当是Sediments are also dropped，but will be located inland at some future date; such beds are sometimes thousands of meters thick.这是一个由分号隔开的并列句，分号前面的句子结构比较复杂，Sediments are also dropped，后面跟了一个由where引导的状语从句,紧接着这个状语从句又加上了一个插入结构， the deposited sediments are on a lake floor or the seafloor at first, 然后才开始进行转折but will be located inland at some future date,但是马上又跟上了一个由when引导的状语从句。分号后面的半句比较简单 such beds are sometimes thousands of meters thick.同学们面对这样的句子一定要先找主干，把状语从句、插入结构纷纷跳过，从纷繁复杂的句子中找出主干来，才能不被ETS出题人改写的句子所迷惑。
译文：
当河流汇入湖泊和海洋的时候也会有沉淀，这些沉淀最初在湖底或海底，但将来海平面下降或者陆地崛起时，它们就会分布于内陆，通常厚达几千米。
意群训练:
Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.
2. In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if they are now below the water’s upper surface (the water table), the gravels and sands of the former riverbed, and its sandbars, will be saturated with groundwater.
难句类型：复杂修饰+省略
本句也是一个由分号隔开的并列句，主句结构是 almost any spot on the ground may overlie what was once the bed of a river; if they are now below the water’s upper surface, they will be saturated with groundwater.但是作者在river后面用that引导了一个定语从句修饰一下river，在surface后面用括号和两个插入成分the gravels and sands of the former riverbed，and its sandbars,打乱了分号前后两个并列句自己内部的主谓宾结构的连贯性。所以阅读时就十分困难。所以我们的对策仍然是先读主干，不重要的定语、状语、同位语、插入成分纷纷略过，读出核心意思来即可。
译文：
低地区域上的任何位置可能就是曾经的河床，后续被土壤覆盖而变成现在的样子。如果那些河床和沙洲现在位于地下水位之下，一定会有大量的地下水浸在它们的沙砾和沙石之间。
意群训练
In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if they are now below the water’s upper surface (the water table), the gravels and sands of the former riverbed, and its sandbars, will be saturated with groundwater.
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