The state of your life is nothing more than a reflection of your state of mind.

The truth is rarely pure and never simple.

The key to sustainable growth is balancing short-term gains with long-term vision.

I would like to fly in space.Absolutely.That would be cool.I used to just do personally risky things， but now I’ve got kids and responsibilities， so I can’t be my own test pilot.That wouldn’t be a good idea.But I definitely want to fly as soon as it’s a sensible thing to do.

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

解释：顺应时代的潮流就会昌盛，背离时代的方向便会走向灭亡。