历史学家是向后看的先知。
The beauty of mathematics is that it is both precise and creative.
教师必须具有健康的体魄,农人的身手,科学的头脑,艺术的兴味,改革社会的精神。
"We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct."