Fundamentally, 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(2018英语一text3)
【生词及词组】：
bread-and-butter product：拳头产品
regulatory structure：监管结构
deny：否认
adjust… to…：
【句子结构分析】：使适应
主干：the USPS is in a historic squeeze
①：介词短语作定语修饰squeeze
②：定语从句修饰change
③：定语从句修饰structure
【参考翻译】：从根本上说，美国邮政处于一种历史性的挤压之中，一方面是技术变革永久地减少了对拳头产品、一流邮件的需求，另一方面是一种监管结构，使管理层无法灵活地根据新的现实调整其业务
