The progress of geology has been greatly retarded by the substitution of imaginary causes for the real.
地质学的进步因用想象的原因代替真实的原因而大大受阻。
We have to be prepared to take some risks, but they must be calculated risks.
你最不满意的顾客是你最大的学习来源。
预测未来的唯一方法是创造未来。