adj. understable
这个概念本身作为一项严肃的研究课题是太过不稳定和欠明了的。
Speech communities turn out to be too fluid and ill-defined to be seriously studied in their own right.
提出了一种能够自产生基准电压和偏置电流，并且锁定阈值电压和迟滞量稳定的新型欠压锁定电路。
A novel under-voltage lockout circuit is proposed which could generate reference voltage and bias current itself, and could stabilize lockout threshold voltage and hysteresis quality.
倒立摆系统是一种典型的非线性欠驱动复杂难控系统，对倒立摆的研究可归结为对非线性多变量、欠驱动、绝对不稳定系统的研究。
The study of this kind of problem can be treated as the study of multivariable, nonlinear, under-actuated and absolutely unstable system.
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