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.
森林的真正价值不是用板英尺来衡量的,而是用生物多样性来衡量的。
我不是治愈者,我是杀手。
现代化学家不满足于仅仅成为化合物的制造者;他必须是自然的解释者。
The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.