人类曾经用药物来庆祝神异的成功。
人类曾经创造了无数的奇迹。
人类曾经耕种土地。
在多灾多难的历史上，人类曾经受过多少苦，经过这么多年。
In the troubled history, human beings have received how many bitter, after all these years.
艾滋病是人类曾经面临的最为复杂、最具挑战性、可能也是最具毁灭性的传染病。
AIDS is the most challenging and probably the most devastating infectious disease humanity has ever had to face.
很多人认为恐龙和人类曾经共存过，但大多数人知道目前的科技并不允许由化石克隆恐龙。
Many believe that dinosaurs and humans once coexisted, but most know that current technology doesn't allow for cloning dinosaurs from fossils.
因此我们可以断言：人类曾经进化过，但是从来没有像其他野兽那样在地上用四肢爬行过。
So we can affirm that human beings have ever evolved, but they had never crept with four limbs on the ground like those beasts.
人类曾经抬头仰望夜空，寻找着自己在星河中的位置；现在我们只是低着头，担心着如何在荒漠中生存。
We used to look up at the sky and wonder at our place in the stars, now we just look down and worry about our place in the dirt.
到那之前，我们必须接受这样的想法，那就是在不可想象的未来时代，这些核垃圾可能是能保留下来证明人类曾经存在的全部。
Until then, we must live with the thought that in some unimaginable future aeons hence, this could be all that remains to prove our species was ever here.
这就好比人类曾经采取措施来适应冰河时代，而现在又要采取措施来适应全球变暖，”亚列夫说到，并且提出削减碳排放量是必要措施之一。
Just like human beings at one point took steps to adapt to the Ice Age, we now have to adapt to this," he says, citing cuts to carbon emissions as one of the necessary adaptations.
就像奥巴马向我们展示过的那样，当然，迪恩之前也这样干过，互联网是人类曾经发明过的一切事物中最强大的资金筹集工具，而我们必须要好好利用它来做得更多更好。
What Obama has shown, and Dean before him, is that the Internet is the most powerful fundraising tool ever invented, and we have to harness it to do more and do better.
马丁·路德·金和约翰·肯尼迪都发起呼吁，倡导人类能够超越曾经被认为是固有局限性的观点。
Both Martin Luther King and John Kennedy appealed to the idea that humans can transcend what were once considered inherent limitations.
正如人类事务的伟大评论家塞缪尔·约翰逊博士曾经说过的那样：“人类智慧的展现方式各不相同,但笑的方式是相同的。”
As that great commentator on human affairs, Dr. Samuel Johnson, once remarked, "Men have been wise in very different modes; but they have always laughed in the same way."
你曾经想过人类可以住在月球上吗？
随着计算机征服了曾经是深入人心的人类任务，作为人类在未来将意味着什么？
With computers conquering what used to be deeply human tasks, what will it mean in the future to be human?
有人会因为曾经遇到某个非人类的医生而嫌恶这个职业。
Some people dislike surgeons because they once met one who did not seem quite human.
人在脊椎末端有一块骨头，这有助于证明人类(可能)曾经有过尾巴。
A human has a bone just after the spine ends, which helps proves that humans once had tails (possibly).
与此同时，一部新的纪录片显示，全球变暖并不总是那么不好的事情，因为它曾经挽救了濒临灭绝的早期人类。
Meanwhile, a new documentary shows that global warming was not always a bad thing as it once saved early man from extinction.
移情作用曾经一度被认为是人类的专利。
社交媒介展示的是人类特质中不会改变的部分，即使在改变曾经看起来不变的本质。
Social media play into the parts of human character that don't change, even while changing the nature of what once seemed immutable.
一位著名的思想家曾经写道：“对人类最大的威胁是人类自身！”
A famous thinker once wrote that the greatest threat to mankind is mankind itself!
难怪，上帝曾经对摩西说：“是谁创造了人类的嘴？”
Little wonder, then, that God said to Moses: 'Who had made man's mouth?
我曾经认为消除地球上人类垃圾的一个好办法是把垃圾扎成一大捆一大捆的，然后如同火箭那样发射到太空去。
I thought that a good way to rid the earth of our human waste would be to rocket it into space in huge bundles.
他们也因为程序曾经击败人类冠军而获得了名誉和财富。
They also hold out the tantalising possibility of fame and fortune should the program ever clobber a human champion.
伟大的比较学派神学大师约瑟夫.坎贝尔曾经说过，“人类不想了解生活本身的意义，他们只要生活的经历。”
The great comparative mythologist Joseph Campbell once said, "People don't want the meaning of life, they want the experience of life.
一年之前，黄武树和他的科研小组就曾经以成功克隆人类胚胎而震惊了整个世界。
That came just a year after his team shocked the world by cloning a human embryo.
曾经一些研究显示猫儿的哭叫声和人类婴儿的哭声相似。
Previous research has shown similarities between cat cries and human infant cries.
曾经一些研究显示猫儿的哭叫声和人类婴儿的哭声相似。
Previous research has shown similarities between cat cries and human infant cries.
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