In this paper the concept of ability order of learning machine is introduced and a model of second order learning machine is given.

本文引入学习机的功能阶数的概念，给出二阶学习机的一种工作模型。

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The second-generation Nest Learning Thermostat is available now for pre-order directly through the Nest Labs website and will ship later this month.

FORBES: World's Smartest Thermostat Is Now Even Smarter