专四35条阅读难句指导：sentence 28
<p> <span word="Although">Although</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="more">more</span> <span word="ambitious">ambitious</span> <span word="programs">programs</span> <span word="require">require</span> <span word="new">new</span> <span word="investments">investments</span> <span word="in">in</span> <span word="servers">servers</span> <span word="and">and</span> <span word="networks">networks</span> <span word="to">to</span> <span word="support">support</span> <span word="collaborative">collaborative</span> <span word="software">software</span>, <span word="most">most</span> <span word="distance">distance</span> <span word="learning">learning</span> <span word="courses">courses</span> <span word="can">can</span> <span word="run">run</span> <span word="on">on</span> <span word="existing">existing</span> <span word="or">or</span> <span word="minimally">minimally</span> <span word="upgraded">upgraded</span> <span word="systems">systems</span>.</p><p> 分析主干：<span word="courses">courses</span> <span word="can">can</span> <span word="run">run</span></p><p> <span word="Although">Although</span> 引导让步状语从句。<span word="investment">investment</span> <span word="in">in</span>...表示在......方面的投资。不定式<span word="to">to</span> <span word="support">support</span>... 是宾语<span word="investment">investment</span> 的补足语，项目需要投资来支持相关软件（因为）<span word="support">support</span> 的逻辑主语不是<span word="programs">programs</span> 而是<span word="investment">investment</span>，所以该不定式应该是补语，而非目的状语）。译文：虽然一些规模更大的课程需要斥资增加新的服务器、扩建网络来支持配套的软件，但大部分远程教育课程可以在现有的或稍加升级的系统上运行。</p><p> </p>
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