評論
打印
But no matter how much power the train has,
但無論列車有多大動力
it can never quite
物理法則的限定
reach the speed of light since the laws of physics forbid it.
使它永遠無法到達光速
Instead, let's say it gets close,
但我們能假定它無限趨近于光速
just shy of that ultimate speed.
僅略微慢一些
Now something extraordinary happens.
神奇的事情就會發生
Time starts flowing slowly on board relative to the rest of the world,
相對于列車外，列車內的時間逐漸減慢
just like near the black hole, only more so.
就如同黑洞周圍的情形，不過更慢
Everything on the train is in slow motion.
列車上的一切動作都緩慢下來
This happens to protect the speed limit,
這是為了維護速度極限
and it's not hard to see why.
我們不難看出其中的原因
Imagine a child running forwards up the train.
試想一個孩子沿列車運行方向奔跑
Her forward speed is added to the speed of the train,
她的速度與列車速度相加
so couldn't she break the speed limit simply by accident?
那她豈不是無意間就打破速度極限了嗎
The answer is no.
答案是否定的
The laws of nature prevent the possibility
自然法則通過減慢列車內的時間
by slowing down time on board.
來防止這一可能的發生
Now she can't run fast enough to break the limit.
這樣她就不可能突破速度極限
Time will always slow down just
時間總是能夠減慢
enough to protect the speed limit.
足以保護極限速度不被突破
And from that fact comes the possibility of
基于此，便產生了
traveling large distances into the future.
通過時間旅行穿梭至久遠未來的無限可能
Imagine the train left the station on January 1, 2050.
假設列車2050年1月1日從站臺出發
It circles the earth over and over again for 100 years
周而復始地環繞地球100年
before finally coming to a halt on New Year's Day, 2150.
最后在2150年元旦停下來
The passengers will have only lived one week because
此時列車上的旅客僅度過了1周
time is slowed down that much inside the train.
因為列車內的時間被減緩了
When they got out,
當他們走出列車
they'd find a very different world than the one they'd left.
會發現世界發生了天翻地覆的變化
In one week, they'd have traveled 100 years into the future.
一周內，他們穿越到了未來100年
