统一自然界基本力的追求是现代物理学中最大的挑战之一。
I don't stop when I'm tired, I stop when I'm done.
生活艰难,事情并不总是顺利,但我们应该勇敢冒险,毫不犹豫地迈出下一步。
The writer's duty is to tell the uncomfortable truths that others prefer to ignore.
Your attitude, not your aptitude, will determine your altitude.