But not even a great health-care system can cure death ——否定前置,把not 放到谓语动词can 后面便可明了
and our failure (to confront that reality) now threatensthis greatness (of ours). ——用and 引导,与前句形成并列,谓语动词是threaten
但是再牛的医疗系统也不能治愈死亡,而我们未能去面对这个事实如今正威胁我们的伟大之处。
These leaders are living proof ——主句
that prevention works ——补充说明是什么样的proof
and that we can manage the health problems ——and 引出并列,同样是补充说明proof 的
that come naturally with age. ——说明problems 的。