可持续性不是一种选择，而是我们对后代的责任。
Sustainability is not an option; it's a responsibility we owe to future generations.
PAC学习框架提供了一种正式的方法来分析学习算法的效率和有效性。
When you're depressed, It always helps to lean your head on your arm. Arms like to feel useful.
可持续性已不再是选择，而是我们对后代的责任。
"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."