Broadly speaking, it means on a large scale.
For example, "Lei Feng"
Lei Feng himself in a narrow sense.
Broadly speaking, it refers to all those who serve the people.
If you're asking about special relativity:
Einstein's theory is mainly based on two postulates and one transformation.
One transformation is Lorentz transformation (the transformation between different inertial systems must be Lorentz transformation).
These two postulates are: the principle of relativity (that is, the laws of physics are the same in all inertial systems. ) and the principle that the speed of light is constant (that is, light always has a certain speed in a vacuum, regardless of the movement of the observer or the light source).
Therefore, there are four inferences (the ruler of movement becomes shorter; The moving clock slowed down; The rest mass of photons is zero; Matter cannot exceed the speed of light) and three relations (velocity synthesis formula; Mass velocity formula; Mass-energy relationship).
General relativity:
Einstein's general theory of relativity explains why there is no difference between gravity and acceleration, and also explains the relationship between gravity and curvature of spacetime. Using mathematics, Einstein pointed out that an object bends the surrounding space and time. When an object has a large relative mass (such as a star), this bending can change the path of any object passing through it, even light. General relativity holds that the bending of space-time will produce gravity. When light passes through some massive celestial bodies, its path is curved, which is due to the curvature of spacetime formed along the massive celestial bodies. Because a black hole is a huge mass concentration, the space-time around it is so curved that even light can't escape. ]Kl 1j
General relativity is a further development of special relativity. It establishes a physical law that takes the same form for all reference systems, and connects the geometric properties of gravity at the same time and space, thus combining matter, gravitational field and space-time into one. This is a developed theory of gravity.
Simply put, one is speed and time and space. One is quality and time and space.