1Moreover, increased privatization would certainly undercut one of the major reasons why 300 million visitors come to the parks each year: to enjoy nature and get a break from the commercial drumbeat that overwhelms daily life.
主干主语：increased privatization；谓语：would undercut；宾语：one of the major reasons
结构why 引导定语从句修饰 reasons。冒号后不定式短语 to enjoy ... and get ... 作 reasons 的同位语，说明具体内容。that overwhelms daily life 是定语从句修饰 drumbeat。get a break from 与 enjoy 并列，同属不定式。
译文更何况，加大私有化势必削弱每年三亿游客前来公园的一个主要理由：亲近自然，并暂时摆脱日常生活中铺天盖地的商业喧嚣。
考点why 定语从句修饰 reason · 冒号后不定式作同位语解释 reason
2An economic survey of 700 U.S. taxpayers found that people would be willing to pay a significant amount of money to make sure the parks and their programs are kept intact.
主干主语：An economic survey；谓语：found；宾语：that 从句
结构of 700 U.S. taxpayers 修饰 survey。that 引导宾语从句。从句中 be willing to pay ... 后接目的状语 to make sure，make sure 后又接省略 that 的宾语从句 the parks and their programs are kept intact，其中 kept intact 为被动结构。
译文一项针对700名美国纳税人的经济调查发现，人们愿意拿出相当一笔钱，以确保国家公园及其项目完好无损。
考点found that 宾语从句套 make sure 宾语从句 · be willing to do 后接目的不定式
3The parks also help keep America's past alive, working with thousands of local jurisdictions around the country to protect historical sites and to bring the stories of these places to life.
主干主语：The parks；谓语：help keep；宾语：America's past；宾补：alive
结构help (to) keep ... alive 为复合宾语。逗号后 working with ... 是现在分词短语作伴随状语，说明公园如何做到这一点。to protect ... and to bring ... 两个不定式并列，作 working 的目的状语。bring ... to life 为固定搭配。
译文公园还助力让美国的过去保持鲜活：它们与全国成千上万个地方管辖机构合作，保护历史遗址，并把这些地方的故事讲活。
考点help keep + 宾语 + 宾补 · 分词短语作伴随状语，后接并列目的不定式
4Congress allocates only $ 3 billion a year to the national park system—an amount that has been flat since 2001 (in inflation-adjusted dollars) with the exception of a onetime boost in 2009.
主干主语：Congress；谓语：allocates；宾语：$ 3 billion；状语：to the national park system
结构破折号后 an amount 是 $ 3 billion 的同位语，that has been flat ... 是定语从句修饰 amount。since 2001 作时间状语，括号为插入说明计价口径。with the exception of ... 介词短语作状语，对“一直持平”作例外限定。
译文国会每年拨给国家公园系统的经费仅30亿美元——按通胀调整后计算，这一数额自2001年以来一直没有增长，仅2009年有过一次额外追加。
考点破折号后名词短语作同位语 + that 定语从句 · with the exception of 引出例外