historic中等

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.

从根本上说，美国邮政署正处于前所未有的两面夹击之中：一方面，技术变革使其核心产品——一类邮件——的需求永久性下降；另一方面，监管体制使管理层无法灵活调整运营以适应新的现实。

The building has housed some of the nation’s most significant diplomats and politicians and has been the scene of many historic events.

这座大楼曾是美国一些最重要的外交官和政治家的办公地，也见证了许多历史事件。

But just some 22,000 birds remain today, occupying about 16% of the species’ historic range.

但如今只剩下约2.2万只，占据着该物种历史分布范围的约16%。