It is the duty of a student to get everything out of a teacher， and the duty of a teacher to get everything out of a student.
从老师那里学到一切是学生的责任，充分激发学生的全部潜力是老师的责任。
The most important thing in mathematics is to understand the concepts, not just to memorize formulas.
我们的科学力量已经超过了我们的精神力量。我们有导弹，但我们的人类道德方向已经偏离。
The writer is the enemy of all dictatorships, whether of the left or of the right.