* A moving clock runs slower than a stationary one from the perspective of a stationary observer.

* 从固定的观察者来看运动中的表比静止的慢。

* A moving object appears to shrink in the direction of motion, as seen by a stationary observer

* 固定的观察者来看运动的物体，它在运动方向上似乎会缩小。

General Relativity

广义相对论

In general relativity, time is considered a dimension like height, width and depth, creating a four dimensional universe called space-time. Einstein argued that gravity is really a warping of space-time,with the greatest distortions near the most massive objects. Because light travels in a straight line through the contours of space-time, a light beam will curve where space-time curves, this curving was first measured in 1919

在广义相对论中，时间被看作和长宽高一样的维度，并与它们构成了一个四维宇宙—被称作时空。爱因斯坦提出万有引力是一种时空变形，在巨大的物体附近有严重的变形。因为光沿时空走直线，所以光线在时空弯曲的地方会弯曲。这现象在1919年首次被观测到。