礼物经济在物质不匮乏的远古时期就已经存在。
Gift economies exist in primitive cultures where scarcity is not a problem.
在时间开始之前，“魔方”就已经存在。
在时间开始之前，“魔方”就已经存在。
英国远古的陆地在没有人类之前就已经存在。
The ancient landscape of Britain is laid out before us as never before.
据我们了解，他们从上世纪90年代就已经存在。
生活垃圾处理问题从人类社会形成之初就已经存在。
The problem of domestic garbage proposal has come into being since the beginning of human society.
这是很有可能的，例如，在太阳系的早期就已经存在。
They could, for example, have existed during the early stages of the solar system.
不过一些新研究表明，水可能在地球诞生之初就已经存在。
A new theory suggests that water was already present at the birth of our planet.
很久以前就已经存在，我们也分享了许多动物，甚至蜥蜴。
That evolved so long ago we share it with many creatures, even lizards.
医学的，或者至少能够治病的职业，在人类一出现时就已经存在了。
Medical, or at least healing professions, have been around since time began.
但是金融过度在华尔街没有一砖一瓦的时候就已经存在了世纪有余。
But financial excesses existed centuries before a brick had been laid on Wall Street.
如果这个包已经不存在，就创建一个。
可是，一旦你感知到问题的存在，改变就已经开始。
But the moment you have become aware of it, the change has begun.
当它已经存在的时候，就已经失去所谓的结果。
你是否认为，在原始宇宙之先，就已经有物种的存在呢？可是那是不可能的。
Do you think that there is species before the original universe has come into being? It is impossible.
其实很早之前就已经听说过，但是没有时间去看，也差点忘记这部片子的存在。
In fact it has been heard long before, but I have no time to look, also almost forget the existence of this film.
你是否认为，在原始宇宙之先，就已经有物种的存在呢？
Do you think that there is species before the original universe has come into being?
一个多世纪以前就已经发现孕妇外周血中存在胎儿细胞。
Fetal cells were identified in maternal blood a century ago.
一个多世纪以前就已经发现孕妇外周血中存在胎儿细胞。
Fetal cells were identified in maternal blood a century ago.
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