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煤炭使美国在世界范围内保持竞争力。
Remember, if you ever need a helping hand, you'll find them at the end of each of your arms. As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.
Information is physical, and the processing of information is always tied to the laws of physics.
成功的投资需要持续的研究和学习,以及不断提升自己的能力。
真正的挑战不是建造一个便宜的房子,而是建造一个居住成本低的房子。