英语翻译People all have their own ideas of what a time machine w

英语翻译
People all have their own ideas of what a time machine would look like.If you are a fan of the 1960 movie version of H.G.Wells's classic novel,it would be a steampunk sled with a red velvet chair,flashing lights,and a giant spinning wheel on the back.For those whose notions of time travel were formed in the 1980s,it would be a souped-up stainless steel sports car.Details of operation vary from model to model,but they all have one thing in common:When someone actually travels through time,the machine ostentatiously dematerializes,only to reappear many years in the past or future.And most people could tell you that such a time machine would never work,even if it looked like a DeLorean.
They would be half right:That is not how time travel might work,but time travel in some other form is not necessarily off the table.Since time is kind of like space (the four dimensions go hand in hand),a working time machine would zoom off like a rocket rather than disappearing in a puff of smoke.Einstein described our universe in four dimensions:the three dimensions of space and one of time.So traveling back in time is nothing more or less than the fourth-dimensional version of walking in a circle.All you would have to do is use an extremely strong gravitational field,like that of a black hole,to bend space-time.From this point of view,time travel seems quite difficult but not obviously impossible.
These days,most people feel comfortable with the notion of curved space-time.What they trip up on is actually a more difficult conceptual problem,the time travel paradox.This is the worry that someone could go back in time and change the course of history.What would happen if you traveled into the past,to a time before you were born,and murdered your parents?Put more broadly,how do we avoid changing the past as we think we have already experienced it?At the moment,scientists don't know enough about the laws of physics to say whether these laws would permit the time equivalent of walking in a circle — or,in the parlance of time travelers,a "closed timelike curve." If they don't permit it,there is obviously no need to worry about paradoxes.If physics is not an obstacle,however,the problem could still be constrained by logic.Do closed timelike curves necessarily lead to paradoxes?

人都有自己的看法与想法的人的时间机器将会是什么样的.如果你是一个喜欢1960年电影版的威尔士的经典小说《,那将是一steampunk雪橇用红丝绒椅、闪动的灯光,一位高大的纺车的背.对于那些时间旅行的概念形成于20世纪80年代以来,它会是一种souped-up不锈钢跑车.的具体操作细节模型,不同,但是它们都有一件事对人都有自己的看法与想法的人的时间机器将会是什么样的.如果你是一个喜欢1960年电影版的威尔士的经典小说《,那将是一steampunk雪橇用红丝绒椅、闪动的灯光,一位高大的纺车的背.对于那些时间旅行的概念形成于20世纪80年代以来,它会是一种souped-up不锈钢跑车.不同的具体操作细节模型,但是它们都有一个共同点:当有人真的,机器穿越时空dematerializes公开,只有再现的很多年过去或未来.而大多数人能告诉你,这样的时间机器不会工作,甚至看起来就像一个DeLorean.
他们将对了一半:那不是时间旅行会奏效,不过时间旅行在一些其他形式不一定了桌子.由于时间是类似于空间(四个维度)携手并进,一个工作时间机器将变焦会像火箭,而不是消失在一股烟.爱因斯坦描述了我们的宇宙在四个维度:三维空间和一个时间.所以穿梭时空回到过去也或多或少的版本比第四度空间的走在一个圆圈.所有你必须做的是使用出极强的重力,像一个黑洞,弯曲时空相连.从这一点看,时间旅行似乎很困难,但也并非显然不可能的.
近来,大多数人感觉舒服的时空的概念.他们的旅行在实际上是一个更难的观念问题,时间旅行悖论.这是担心有人时光倒流,改变历史的进程.你游览过会出现什么过去,时间在你出生之前,并杀害了你的父母呢?把更广泛的说,我们如何避免改变过去,我们认为我们已经经历过吗?目前,科学家不够了解物理学的法则能说准这些法律允许的时间相当于走在一个圆圈-或以时间旅行者上的说法,“关闭timelike曲线.”如果他们不允许的,很明显,没有必要担心自相矛盾.如果物理不是障碍,不过,这个问题仍然可能会受到的逻辑.做只会timelike曲线封闭的似是而非的说法吗?