Facebook不止在用户数量上是空前的，它模糊现实和虚拟世界之间界限的能力也是前所未有的。
Facebook is unprecedented not only in its scale but also in its ability to blur boundaries between the real and virtual worlds.
人类科学知识以前所未有的速度剧增，科学技术以空前的规模迅猛发展。
Human scientific knowledge increase sharp by unprecedented speed, science and technology swift and development violent by unprecedented scale.
靖康之难，造成中国历史上空前的民族迁移的同时，中国的文士也遭遇到前所未有的灾难和考验。
JIKANG it is difficult, and result in the unprecedented race in Chinese history to move at the same time, and China's text person also fall among the unprecedented disaster with test.
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