显然，一个项目在开始时风险最大的，因为未知的总是在前面；在项目的一开始你几乎很少知道什么是项目的所有风险。
Obviously, a project is riskiest at the start, because of the unknowns that lie ahead; you rarely know what all the risks are at the start of a project.
在什么年龄开始学第二门语言才能够产生推迟痴呆症的效果也是未知的。
The age at which the second language needs to be acquired to yield the protective effect is also unknown.
插值解决了以下问题：鉴于价值在一些未知函数的若干要点，没有什么价值的功能已经在一些其他点之间的了点数？
Interpolationsolves the following problem: given the value of some unknown function at a number of points, what value does that function have at some other point between the given points?
不论是另一个国家也好，在本地也好，没有什么比探索未知领域更让人兴奋了。
There are few things more exhilarating than exploring uncharted territory, whether it's in another country or in your own city.
十多位专家在接受采访时说，极端的夏季冰撤退透露至少尽可能多的关于北极仍然未知什么是清楚的。
More than a dozen experts said in interviews that the extreme summer ice retreat had revealed at least as much about what remains unknown in the Arctic as what is clear.
十多位专家在接受采访时说，极端的夏季冰撤退透露至少尽可能多的关于北极仍然未知什么是清楚的。
More than a dozen experts said in interviews that the extreme summer ice retreat had revealed at least as much about what remains unknown in the Arctic as what is clear.
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