研究基因如何控制动物行为的研究人员不得不面对许多不确定因素。
Researchers studying how genes control animal behavior have had to deal with many uncertainties.
我们每个人对这些不确定性的感觉也有差异，不仅仅是不同的人有不同的答案，即便同一人在面对一系列不确定因素时，也会有不同的反应。
Each of us feels differently about these uncertainties, so not only are the answers different for different people, but also different for the same person confronting a range of uncertainties.
勇气是面对危险，困境，不确定因素和痛苦而毫不畏惧，或是敢想敢干的气概。
Courage is the ability to face danger, difficulty, uncertainty, or pain without being overcome by fear or being deflected from a chosen course of action.
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