PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。
The gallery space is just as important as the work it contains.
任何有价值的人生都是一个持续的寓言。
The characters I paint are not children, they have a rebellious spirit.
伟大的领导者倾听多于发言，行动多于计划。