1Fundamentally, the USPS is in a historic squeeze between technological change that has permanently decreased demand for its bread-and-butter product, first-class mail, and a regulatory structure that denies management the flexibility to adjust its operations to the new reality.
主干主语：the USPS；谓语：is；表语：in a historic squeeze（介词短语作表语）
结构主干为 the USPS is in a historic squeeze，核心结构是 between A and B：A 为 technological change，后接 that 引导的定语从句，从句中 first-class mail 是 product 的同位语；B 为 a regulatory structure，同样接 that 定语从句，从句内 deny sb. sth. 为双宾结构，to adjust... 不定式作 flexibility 的后置定语。两个长定语从句使 between...and... 跨度极大，易读丢。
译文从根本上说，美国邮政正被夹在两大力量之间饱受挤压：一是技术变革，它永久性地降低了人们对其拳头产品——一类邮件——的需求；二是监管体制，它剥夺了管理层根据新形势调整运营的灵活性。
考点between A and B 结构中 A、B 各带长定语从句，需先抓介词框架再填内容 · deny sb. sth. 双宾结构：denies management the flexibility，意为「使管理层失去灵活性」
2And interest groups ranging from postal unions to greeting-card makers exert self-interested pressure on the USPS's ultimate overseer – Congress – insisting that whatever else happens to the Postal Service, aspects of the status quo they depend on get protected.
主干主语：interest groups；谓语：exert；宾语：self-interested pressure
结构主干为 interest groups exert pressure on...overseer。ranging from...to... 现在分词短语作后置定语修饰 groups；破折号间 Congress 是 overseer 的同位语；insisting 现在分词作伴随状语，其宾语从句中 whatever else happens... 是让步状语从句，主句 aspects...get protected 为虚拟语气（should 省略），they depend on 是省略 that 的定语从句修饰 status quo。
译文而且，从邮政工会到贺卡制造商，各利益集团都出于私利向邮政的最终监管者——国会——施压，坚持要求无论邮政发生什么变故，他们所依赖的现状的方方面面都必须得到保护。
考点insist 表「坚持要求」时宾语从句用虚拟语气，get protected 中 should 被省略 · whatever 引导让步状语从句，相当于 no matter what，从句需提前识别
3Legislation is moving through the House that would save USPS an estimated $28.6 billion over five years, which could help pay for new vehicles, among other survival measures.
主干主语：Legislation；谓语：is moving；状语：through the House
结构主干为 Legislation is moving through the House。that 引导的定语从句修饰 Legislation，因从句较长而被谓语隔开，形成分隔式定语从句，切勿误以为修饰 House；which 引导非限制性定语从句，指代前面的 $28.6 billion（或整笔资金）；among other survival measures 为介词短语作插入性状语。
译文一项法案正在众议院推进，预计五年内可为美国邮政节省约 286 亿美元，这笔钱可用于购置新车等维系生存的举措。
考点分隔式定语从句：that 从句与先行词 Legislation 被谓语 is moving 隔开，防止头重脚轻 · which 非限制性定语从句的指代对象是钱而非法案，需结合语义判断
4If it clears the House, this measure would still have to get through the Senate – where someone is bound to point out that it amounts to the bare, bare minimum necessary to keep the Postal Service afloat, not comprehensive reform.
主干主语：this measure；谓语：would have to get through；宾语：the Senate
结构If 引导条件状语从句，clears 意为「获得通过」。主句中 where 引导非限制性定语从句修饰 Senate；point out 后 that 宾语从句的主干是 it amounts to the minimum，necessary to keep...afloat 为形容词短语作后置定语修饰 minimum，not comprehensive reform 是与 minimum 并列的补足成分，bare 重复表强调。
译文即便这项法案在众议院过关，仍须闯过参议院——那里必定有人指出，它仅仅是让邮政免于沉没的最低限度的最低限度举措，算不上全面改革。
考点clear 作动词表「顺利通过（审批）」，get through 同义，均为熟词僻义 · amount to 后接名词性成分，意为「等同于、不过是」，暗含贬义