Curtis says the surge will also reassure India that the Americans are there to stay and do not intend to cut and run, leaving behind an unstable Afghanistan and Pakistan, which would be a definite problem for India.

VOA: standard.2009.12.06

Six-month-olds don't, and even 12-month-olds don't find anything weird about this, while adults are sophisticated enough to understand that that's an unstable configuration and should fall over.

六个月大的婴儿则不会这么想,即使是十二个月大的婴儿,也没有发现这个木块存在的异常,只有经历世事的成年人才会理解,这不是个稳定的结构,而这个结构是会倒塌的

耶鲁公开课 - 心理学导论课程节选

With a fractional reserve system you're in an unstable equilibrium.

伴随着部分准备金银行制度,英国的银行业处于一个不平稳的均衡中。

耶鲁公开课 - 金融市场课程节选