Even morning low temperatures in Phoenix are tying historic records.

凤凰城甚至连早晨的低温都追平了历史纪录。

There is no historic record of what happened to her mother, but most historians believe that she must have died during childbirth.

关于她的母亲后来怎么样了并没有历史记录，但大多数历史学家认为她肯定是在分娩时死亡了。