1. On the day her son began school, she meditated on the uncertainties of his future. 在她儿子入学那天，她深思了有关他未来的种种不确定因素。
2. Researchers studying how genes control animal behavior have had to deal with many uncertainties. 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。
3. Terrorism, economic uncertainties and general feelings of insecurity have increased people's anxiety. 恐怖主义、经济不确定性和普遍的不安全感增加了人们的焦虑。
4. Automatic control here should allow for smooth merging without the usual uncertainties and potential for accidents. 此处的自动控制应该允许平滑合并，没有通常的不确定性和事故的可能性。
5. Assisted migration could become a viable part of our rescue strategy, but there are a number of uncertainties and risks. 协助移徙可能会成为我们救援战略中可行的一部分，但也有一些不确定性和风险存在。
