It is one of only two copies in existence in good condition, and was coined 'the impossible black tulip of cartography' by experts strugging to track it down.

这是仅有的保存完好的两份地图之一，被追溯其踪迹的专家称为制图史上的‘不可能的黑色郁金香’。

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It's hard to speculate what could bring down the Net, but it's not impossible.

要想猜测出究竟什么会把互联网搞垮并不容易，但那并不是不可能的。

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The vast nature of the Internet, however, makes it essentially impossible to stop something, or take it down, once it has gone out over multiple servers.

然而，互联网的庞大系统使得一旦事情被散布到许许多多的服务器上，阻止事情的传播或者摧毁它就基本上不可能。

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First of all, it's simply easier, because it avoids trying to find the right price for mortgage-backed securities whose value is impossible to pin down at the moment, Davidson explains.

NPR: Was The Bailout Bill A Good Idea?

Though the numbers are impossible to nail down, managers describe the dollars involved as in the billions from a combination of loan-only and multi-strategy credit funds.

FORBES: Connect

If you want to get down with the new Zune player it's impossible not to notice the new Zune desktop software.

ENGADGET: New Zune review (part 2): upgrade, hardware, software and Social