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第十八单元 | 托福长难句
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1. The problem[主语] is[系动词] that as blood flows through the turtle's flippers,[时间状语从句] it risks losing enough heat to lower the animal's central body temperature[从句主句] when it returns[时间状语从句].[表语从句]
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2. In a countercurrent exchange system, the blood vessels carrying cooled blood from the flippers[后置定语] run close enough to the blood vessels[主句] carrying warm blood from the body[后置定语] to pick up some heat from the warmer blood vessels;[目的状语] thus, the heat is transferred from the outgoing to the ingoing vessels[结果状语从句] before it reaches the flipper itself[时间状语].
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第十八单元
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