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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。《柯林斯英汉双解大词典》

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。

6·They tried to buffer themselves against problems and uncertainties.

他们尽力保护自己免受困难和不确定因素的影响。《牛津词典》

7·Is it possible to enjoy a peaceful life in a world that is increasingly challenged by threats and uncertainties from wars, terrorism, economic crises and a widespread outbreak of infectious diseases?

当今世界，战争、恐怖主义，经济危机和大规模爆发的传染性疾病等威胁和未知因素层出不穷，人类能否在这样一个环境中享受和平生活？

8·But there are uncertainties.

但是，同时也存在着一些不确定性。

9·But China's suppliers face uncertainties.

但是中国的供应商面临不确定性。

10·China still faces big uncertainties in 2010.

中国在2010年仍将面临巨大的不确定性。

(1)uncertainty of measurement测量不确定度

(1)uncertainty analysis定性分析；不确定性分析

(1)uncertainty principle测不准（不定性）原理

(1)uncertainty relation不确定关系