One has to use a quantum theory of gravity to understand how the universe began.

人们必须使用量子引力理论来理解宇宙是如何开始的。

So one has to use a quantum theory of gravity to discuss the very early stages of the universe.

因此，人们必须使用量子引力理论来讨论宇宙的早期阶段。

It was this that led to the first hints of how the theories of quantum mechanics and general relativity might affect each other—a glimpse of the shape of a quantum theory of gravity yet to come.

正是这一点导致了量子力学和广义相对论如何相互影响的第一个暗示——瞥见了尚未出现的量子引力理论的形状。