However, adolescence is a period of intense physiological change, and therefore stability of the underlying metabolic structure and clinical categorization based on metabolic risk is uncertain.

然而，青少年时期其生理状况会出现显著的改变，因此，潜在的代谢构成的稳定性和基于代谢风险因子的临床确诊也是不肯定的。

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The design of variable structure control for uncertain discrete time systems is discussed.

研究了不确定离散时间系统的变结构控制设计问题。

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To the problem of the actuator constraints in practical control systems, the output regulation is studied for robot manipulators with uncertain structure parameters and external disturbance.

针对实际的控制系统中执行器受限的问题，研究了机器人存在不确定结构参数及外界干扰时的输出调节问题。

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All inquiries concluded that there was a lack of competition in the provision of personal banking services, which made the charging structure difficult for customers to understand and switching accounts an uncertain process.

BBC: OFT warns banks to change or face competition probe