Could life have existed there?
可能有生命存在？
Vampires have existed since a long time ago.
吸血鬼很久以前就有。
ARGs could not have existed before the Internet.
在英特网之前是不可能出现虚拟现实游戏的。
It makes it easier to believe they could have existed.
这更容易让人相信它们曾经存在过。
I have existed; to be back to nothingness is such a tragedy.
已经存在过，如果还回虚空，真悲哀。
In China, fans have existed for three or four thousand years.
中国扇子的历史有三四千年之久。
Oil and gas explorations have existed for nearly thirty years.
石油和天然气勘探存在了几乎三十年。
This new version is the past, and no different past can ever have existed .
这是过去的翻版，与过去的毫无区别。
They could, for example, have existed during the early stages of the solar system.
这是很有可能的，例如，在太阳系的早期就已经存在。
It has discovered another place in the universe where life could once have existed.
它发现了宇宙中另一个也许曾经孕育过生命的星球。
Our Human society could definitely not have existed or advanced without either of them.
我们人类社会肯定不存在或没有任何先进的。
Without this guitar The Beatles may never have existed, and it is a fantastic acquisition.
如果没有这把吉他，甲克虫乐队可能从来就不会存在，这是一件奇妙的所得。
For the most part, philosophers exist, and have always existed, outside the public spotlight.
在大多数时候，哲学家们存在于，或者说几乎总是存在于公众关注的焦点之外。
Little did I know that something existed that might have saved my phone.
我不知道原来还有一种东西可以拯救我的手机。
But could anything have always existed?
但一个东西有可能原来就存在吗？
他们从来就一贯存在。
Central Banks have not always existed.
中央银行不是一直都有的。
You know it existed, But have forgotten.
妳知道它存在过，但却已经忘记。
Lycurgus, if only be had existed, would have been a still more notable example.
莱库格斯如果确有其人的话，就更是一个显著的例子了。
It is fortunate that such change have really existed in the Photo tigers.
幸运的是，这些变化确实存在于照片虎中。
I am trying to create new shapes of book which have never existed.
目前我正在准备设计一本书的外型，是市面上从未见过的。
One would hardly have guessed the close relationship that existed between them.
几乎没人能猜透他们之间的亲密关系。
Besides, clone have already existed in natural animal and microbe.
此外，克隆已经在自然的动物和微生物的存在。
Besides, clone have already existed in natural animal and microbe.
此外，克隆已经在自然的动物和微生物的存在。
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