在广义相对论中，引力被描述为时空的弯曲。

In general relativity, gravity is described as the curvature of ___spacetime.

爱因斯坦的理论表明，时空可以被大质量物体弯曲。

Einstein's theory shows that ___spacetime can be warped by massive objects.

爱因斯坦的理论将空间和时间统一为时空这一概念。

Einstein's theory unifies space and time into the concept of ___spacetime.