这样的周年庆绝不是值得庆祝的理由，但它们至少提供了一个机会，让我们回顾这些年来有哪些事情发生了改变 — — 以及同样重要的，有哪些事情没有发生改变。
While such anniversaries are not exactly cause for celebration, they at least afford an opportunity to look back and examine what has changed – and, no less important, what hasn’t.