the production possibilities frontier is a graph showing the

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the production possibilities frontier is a graph showing the various combinations of output that th
那位高人能分析一下上面的句型,
整句是：the production possibilities frontier is a graph showing the various combinations of output that the economy can possibly produce given the availble factors of production and technology .

楼主给,你划分一下句子成分：
The production possibilities frontier || is | a graph【1.showing the various combinations of output (that the economy can possibly produce)】（2.given the availble factors of production and technology）.
即本句是主系表结构,主语the...frontier,谓语是系动词is,表语a graph；后面都是对graph的修饰成分,分别是两个非谓语动词后置,前者showing...套一个定语从句,后者given.
这就确定了句子的主体：产能界限图是一张图表.
接下来看是怎样的一张图表,
修饰成分1：
【showing the various combinations of output (that the economy can possibly produce)】
showing,与graph是主谓关系,即“图表展示了产出的多种组合方式”；
that从句修饰output,且output与produce是动宾关系,做从句宾语,即“经济状况在未来将有可能达到的产出值”.
结合来看：图表以各种组合的形式展示了经济在未来将达到的预期产值水平.
修饰成分2：
graph（given the availble factors of production and technology）
given表示被动,即graph做其宾语,被给予了生产和技术可用的因素.
即图表中出示了生产和技术可用的因素.
结合整段：
产能界限图,在给出生产和技术可用的因素的前提下,通过各种组合的形式,在图表上展示了经济在未来将达到的预期产值水平.

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