Gravity is generated by variations in the curvature of spacetime— the three dimensions of space plus time— which bend around any object that has mass.

引力是由时空曲率的变化产生的— —空间的三个维度加上时间— —它会围绕任何有质量的物体弯曲。

The original idea that black holes could  exist came from our understanding of Einstein's theory of relativity published in  1915, where gravity is explained as the curvature of spacetime.

黑洞可能存在的最初想法来自我们对爱因斯坦在1915年发表的相对论的理解，其中引力被解释为时空曲率。

At the centre of the black hole is a singularity  where all of the mass of the black hole is squeezed into an infinitely small region of  infinite density creating an infinite curvature of spacetime.

黑洞的中心是一个奇点，黑洞的所有质量都被挤压到一个无限小的密度区域，从而产生无限的时空曲率。