Every tree we plant today is an investment in tomorrow's clean air and healthy ecosystems.
今天我们种下的每棵树都是对未来清洁空气和健康生态系统的投资。
The PAC learning framework provides a formal way to quantify the learnability of a concept class.
唯一真正的歌是心灵之歌。
我相信毅力的力量。
即使你不完美，你也是限量版。