在GR中,引力场各处的时钟快慢不同,引力场中各处的量杆长短不同,但是,引力场中的光速却是不变的.这意味着引力场时空弯曲了,欧几里德几何规律不再成立.其根本原因正是爱因斯坦所开创的广义相对论的几何化纲领.
In GR,the clock speed around gravitational field is different and gravitational field around the measuring of rods lengths is different,however,the speed of light around gravitational field of space-time is constant.These mean that the gravitational field of space-time is curved and the law of Euclidean geometry is no longer valid.The fundamental reason is Einstein's geometrization program.