在物理学中的对称性，事实上意味着某种基本量不可观测。

Actually the symmetry in physics means unmeasurable for certain fundamental quantities.

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被动式目标跟踪主要存在两个问题：系统非线性和距离不可观测性。

There are two main problems in bearing-only tracking: system's nonlinearity and inscrutability of the range of target.

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无仪器辅助情况下，肉眼不可观测到的活体生物，如细菌，霉菌，病毒或寄生物等。

Living things such as bacteria, molds, viruses and parasites that cannot be seen with the unassisted human eye.

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Science, particularly more advanced sciences like physics or chemistry, are all about unobservables.

科学，尤其是像物理,或者化学这样较为尖端的科学，研究的都是不可观测的事物。

耶鲁公开课 - 心理学导论课程节选

And so, the behaviorist manifesto would then be to develop a science without anything that's unobservable and instead use notions like stimulus and response and reinforcement and punishment and environment that refer to real world and tangible events.

因此，行为主义者的目标,是建立一门科学,将一切不可观测的事情都排除在外,取而代之的是应用,诸如刺激，反应，强化，惩罚,以及表示现实世界和客观事件的环境,之类的概念来进行研究。

耶鲁公开课 - 心理学导论课程节选