For complex systems, uncertainty is usually the biggest risk a program faces in the early stages of development.

对于复杂的系统，不确定通常是一个程序在开发的早期阶段面临的最大的风险。

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There's also uncertainty about what NASA will do after the space station, which will be the focus on the U.S. human space program until at least 2020.

而且现在也不清楚NASA还会做些什么，而这将是美国人类太空计划持续到2020年的工作重心。

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Besides the initial uncertainty of the program, the design of the competition aimed, as starting point, for an organizational strategy to solve the necessities of the future rehousing.

除了项目一开始的不确定性以外，在设计伊始，竞赛方案旨在解决必要的房屋安置的组织策略。

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With Social Security, the program experienced over a decade of uncertainty.

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Like the muddled response in high finance, the reaction to this program on the ground is filled with uncertainty.

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Now there is uncertainty in the industry because of proposed changes to the foreign worker visa program.

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