An adaptive iterative learning control approach is proposed for a class of single input, single output uncertain nonlinear systems with completely unknown high frequency learning gain.

针对一类单输入单输出不确定非线性重复跟踪系统，提出一种基于完全未知高频反馈增益的自适应迭代学习控制。

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Being liked creates opportunities for learning and for new kinds of life experiences that help somebody gain an advantage.

受人喜欢为学习和新的生活体验创造了机会，这有助于人们获得优势。

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Even though none of us is ever going to be perfect, every new competency we conquer does have a long-lasting impact on our children, from understanding how to teach children self-control, to helping them gain confidence, to learning how to gain their cooperation (so we don't resort to yelling).

CNN: A different kind of parenting resolution

Far from a zero-sum game, where the successes of some come at the expense of others, free economies climb spirals of mutual gain and learning.

FORBES: The Wonders of Wealth, the Path Out of Poverty

Ofsted chief inspector Christine Gilbert said young people could gain tremendously from learning an additional language.

BBC: Languages weak in too many secondary schools - Ofsted