Using sticks or other tools to find food isn't unknown among birds and animals.

"鸟类和其他动物懂得使用树枝或其他工具寻找食物。

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These statements involve known and unknown risks, uncertainties and other factors, which may cause actual results to be materially different from those expressed or implied in the statements.

这些前瞻性陈述包括了一些已知和未知的风险和不确定因素，事实结果会同这些预测产生巨大的分歧。

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On the other side of success is the unknown, and believe it or not, the unknown is often scarier than the known world of struggle and unfulfillment this side of success.

成功的另一面是未知，不管你相信与否，未知都比现实世界中的斗争和未达到成功更可怕。

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It has some grammar structure and words from several other languages that are unknown or that have disappeared.

VOA: special.2009.12.02

This process will remove the risk of other unknown or undetected malware that may be present on your machine.

FORBES: IBM Distributes Malware-Infected USB Sticks At Security Conference

However, whether the same processes take place in people or other animals is unknown.

BBC: Light in womb 'gives healthy eyes' - in mice

How quickly the central banks of these big emerging nations draw down their dollars in favor of some other asset or currency is unknown.

FORBES: What Happens in a World Without Dollars?