Some uses of color in nature remain unknown, but one thing is for sure, color not only makes our planet beautiful but it is also necessary for our planet to live on.

颜色在自然界的一些用途仍然未知，但有一件事是肯定的，颜色不仅使我们的星球变得美丽，也是我们的星球得以生存的必要条件。

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With time you will start understanding that all those fears are just crap that your brain creates to protect you from the unknown but you’ll also know that this unknown is not THAT dangerous.

久而久之你会渐渐领悟其实所有的恐惧都是你的大脑出于保护自己的本能而产生的，而且你也会领悟到那些未知的恐惧没有你潜意识中认为的那样危险。

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But the study also found that these chemical reactions produce byproducts with unknown and possibly harmful effects on health.

但是这项研究同样发现了这些化学反应产生了未知且有可能对身体有危害影响的副产物。

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Not only did the always interesting Lady Gaga show up inside a large egg-like structure, but unknown artists also won top prizes.

VOA: special.2011.02.18

"Panguite is an especially exciting discovery since it is not only a new mineral, but also a material previously unknown to science, " study researcher Chi Ma, a senior scientist at Caltech, said in a statement.

MSN: 1969 fireball meteorite reveals new ancient mineral

It might, possibly, create 67, 000 that we can see, but it will also destroy some unknown number that we cannot see.

FORBES: If Apple Onshored iPad Production it Would Create 67,000 American Manufacturing Jobs!

At Index Ventures, we have modelled the early stage development process (up to proof of clinical concept) on the presumption that the majority of the risk in a discovery programme is not only unknown but it also unknowable (ahead of testing in man).

FORBES: Are We The Problem? The Role Of Poor Decision-Making In Stifling Drug Development