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The human race has only two options
为了寻找高等外星生物
when it comes to looking for advanced aliens.
人类只有两种选择
We can listen, or we can be more active
静静倾听，抑或更主动一些
and broadcast our willingness to talk.
向宇宙发布我们与外星人交流的期待
We'd have to think very carefully about what we might say.
我们必须谨慎考虑将要说的话
I think this might be just a little too risky.
我认为这有些过于冒险
We only have to look at ourselves to see
我们看看自己就能明白
how intelligent life might develop into something we wouldn't want to meet.
智能生物已达到的发达程度，也许还是不见为妙
We humans are already capable of manipulating the course of our own evolution.
我们人类已经掌握了控制自身进化的技术
Exactly the same, presumably, would be true of advanced extraterrestrials.
假设，高级外星人也具备相同能力
Ultimately, they could halt aging and become virtually immortal.
他们也许最终能够停止衰老，甚至长生不老
What's more,
不仅如此
they might have reached that point millions of years ago.
他们可能早在百万年前就已达到这种水平
It might sound unlikely,
这听起来也许有些耸人听闻
but if you think about it logically,
但如果按逻辑推理一下
alien technology should be
就能想到，外星人的技术
as extraordinary to us as a rocket ship to a caveman.
绝不会逊色于我们从山顶洞人发展到制造火箭
I imagine they might exist in massive ships like these,
我觉得他们耗尽了自己星球的所有能源后
having used up all the resources from the home planet below.
可能生活于这样的大型飞船中
Such advanced aliens would perhaps become nomads
此类高等外星生物也许会成为游牧物种
looking to conquer and colonize whatever planets they can reach.
伺机征服并掌控任何能够达到的星球
If so, it makes sense for them to exploit each new planet for
当真如此，也难怪他们会寻找新的星球
materials to build more spaceships so they could move on.
搜集更多搭建飞船的材料以维持航行
Who knows what the limits would be?
谁知道有什么阻挡得了他们
