煤炭使美国在世界范围内保持竞争力。
The human condition is one of perpetual suffering.
I believe in the power of literature to change the world.
The universe is a vast and mysterious place, and we are only beginning to understand its complexities.
"The power of words is that they can change the world."
我不是最聪明的人,但我是最努力的人。