In physics, relativity is Einstein’s picture of how time, space, and movement fit together. The short version people repeat is that time and space are not fixed for everyone: they depend on how you are moving, and nothing with mass can go faster than light.

In physics在物理學裡, relativityrelativity is Einstein's picture of how time, space, and movement fit together是愛因斯坦對時間、空間和運動如何搭配在一起的看法. The short version people repeat is that人們常講的簡短版本是: time and space are not fixed for everyone時間和空間對每個人來說不是固定的: they depend on how you are moving它們取決於你移動的方式, and nothing with mass can go faster than light而且有質量的東西都不能跑得比光快.

There are two famous parts. Special relativity (1905) deals with steady motion and gave us E = mc². General relativity (1915) is about gravity: mass bends space and time, and that bending is what we feel as gravity. Scientists still use both every day — GPS clocks have to allow for them, or your map would slowly go wrong.

There are two famous parts有兩個有名的部分. Special relativity (1905)狹義相對論(Special relativity, 1905) deals with steady motion討論的是等速運動, and gave us E = mc²並且給了我們E = mc². General relativity (1915)廣義相對論(General relativity, 1915) is about gravity講的是重力: mass bends space and time質量會使空間和時間彎曲, and that bending is what we feel as gravity而我們感受到的重力就是那種彎曲. Scientists still use both every day科學家現在每天都還在用這兩者 — GPS clocks have to allow for themGPS的時鐘就必須把它們考慮進去, or your map would slowly go wrong不然你的地圖會慢慢跑掉.

Though actually, when everyday English says “it’s all relative,” that is a loose slogan, not Einstein’s theory. He was not saying that every opinion is as good as every other. He was saying very exact things about measuring rods, clocks, and light.

Though actually不過其實, when everyday English says "it's all relative,"日常英文說『it's all relative』的時候, that is a loose slogan, not Einstein's theory那只是一句籠統的口號，不是愛因斯坦的理論. He was not saying that every opinion is as good as every other他不是在說每個意見都一樣好. He was saying very exact things about measuring rods, clocks, and light他講的是關於測量尺、時鐘和光，非常精確的事情.