The authors briefly review the theory of cost-sensitive learning, and the existing cost-sensitive learning algorithms.

简要地回顾了代价敏感学习的理论和现有的代价敏感学习算法。

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Experts believe that brain structure plays an important role in this "sensitive period" for learning language, which is believed to end around adolescence.

一些专家认为大脑结构会影响人们语言学习的敏感期，而敏感期止于青春期。

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People with sensitive skin have to watch which washing powder they use. Folk with sensitive stomachs have to be careful with their diet - as many are learning to their cost at this time of year.

敏感体质的人要注意自己的皮肤和肠胃，不要用洗衣粉和不洁饮食，很多人在这段时间里会更多的关注自我。

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"This particular issue is very sensitive to customers and we've done some learning, " said Delta spokesman Paul Skrbec.

WSJ: Saving Frequent-Flier Miles From the Ax

It uses machine learning and social media and is very sensitive to privacy concerns often associated with mining data about individuals.

FORBES: You Had Me At 'Shalom'

Researchers at Stanford University and MIT's Picower Institute for Learning and Memory had activated light-sensitive neurons in the brain's hippocampus involved in the memory of fright.

WSJ: Scientists Cast Light Onto Roots of Illness Deep in the Brain