As they leave the lens and move back through the air, the rays are angled slightly more toward that central axis, due to the lens’s curvature.

当它们离开镜过空气返回时，由于镜的曲率，光线微偏向中心轴。

As they leave the lens and move back through the air, the rays are angled slightly more toward that central axis, due to the lens's curvature.

当它离开透镜再次穿过空气时，由于透镜的曲率，光线的角微偏离这个中心轴。

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区域，从而产生无限的时空曲率。