The PAC learning framework provides a formal way to analyze the efficiency and effectiveness of learning algorithms.
没有我们开采的金属，能源转型就无法实现。
"I love to make people laugh, especially kids."
领导就是服务。
The world is full of small kindnesses, if you know where to look.
People fear what they don't understand and hate what they can't conquer.
试管婴儿的未来是使其更简单、更安全、更易于获得。