There are two distinct theoriesofrelativity, both proposed by Albert Einstein.
有两种不同的相对论，二者都是爱因斯坦提出来的。
2
During his career he made significant contributions to the world of theoretical physics, among them his famous theoriesofrelativity.
在他的职业生涯中，他对理论物理学界做出了巨大贡献，相对论就是其中之一。
3
Earlier this year Hawking he said that a spaceship capable of travelling through time - but only forwards - would breach Albert Einstein's theoriesofrelativity.