问题标题：
杨鹏长难句里面的一个句子thisis,thedepletionofavailablenewland...ThehistorianFrederickJ.Turnerwroteinthe1890'sthattheagrariandiscontentthathadbeendevelopingsteadilyintheUnitedStatessinceabout1870hadbeenprec
问题描述：
杨鹏长难句里面的一个句子thisis,thedepletionofavailablenewland...
ThehistorianFrederickJ.Turnerwroteinthe1890'sthattheagrariandiscontentthathadbeendevelopingsteadilyintheUnitedStatessinceabout1870hadbeenprecipitatedbytheclosingoftheinternalfrontier——thatis,thedepletionofavailablenewland neededforfurtherexpansionoftheAmericanfarmingsystem.
thisis到后面的部分是什么成分?修饰哪里?
关鸿雁回答：
thedepletionofavailablenewland 是theclosingoftheinternalfrontier的同位语,解释说明了边远地区封闭加剧的原因；而neededforfurtherexpansionoftheAmericanfarmingsystem.则是
thedepletion的定语,意思是指对美国农业体系中进一步扩展的可用的新土地的消耗.
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