Coal is not just a commodity, it's a commitment to America's future.
煤炭不仅仅是一种商品，它是对美国未来的承诺。
自适应控制的核心是从经验中学习并相应地调整控制器。
And when you’re down in the hole， when that moment comes， it’s really okay to feel bad for a little while. Give yourself time to mourn what you think you may have lost but then here’s the key， learn from every mistake because every experience， encounter， and particularly your mistakes are there to teach you and force you into being more who you are. And then figure out what is the next right move.
Life is not about waiting for the storm to pass, it’s about learning to dance in the rain.