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The greatest wisdom is to know that you know nothing.

夢想家是只能在月光下找到路的人，他的懲罰是比世界其他人更早看到黎明。

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.

煤炭不僅僅是一種商品，它是對美國未來的承諾。

The future belongs to those who can balance profitability with purpose.