He not only proved that he could do arithmetic ,but he learned early in life from his own experience that,if a person goes at a job ,with determination and purpose,he may astonish himself as well as others by his ability.

• 他不仅证明自己能做算术题，而且通过早年的经历认识到，如果一个人在工作时有毅力和目标，他的能力会让自己和旁人吃惊的。