The PAC learning framework provides a formal way to quantify the learnability of a concept class.

生命之所以有意义是因为它会停止。

We may be older now, but the passion for performing is still the same.

Collaboration across borders is essential to combat deforestation and climate change.《全球森林管理》

美国是世界上最强大的国家，在可预见的未来仍将如此。