我总是唯一的，但是有时候我时间旅行的时候会去一些地方，我还是我，但是你也可以说有两个我，甚至是更多。

There's always only one me, but when I'm time traveling sometimes I go somewhere I already am, and yeah, then you could say there are two. Or more.

youdao

顺便一说，在爱因斯坦的理论中没有什么能阻止时间旅行，通过它可以走向未来也能回到过去。

Incidentally, there is nothing in Einstein's theory that prohibits time travel, be it into the future or into the past.

youdao

目前为止，在现实生活中时间旅行是不可能的，斯莫扬诺夫说，而这种新材料表明时间旅行永远都不会发生。

So far time travel hasn't been possible in real life, Smolyaninov said, and this new material suggests it won't ever be possible.

youdao