过观察(observe)物质之间的反应，他改变了许多。他越学化学，就越觉得有兴趣。他现在的目标是成为一名化学家，在化学领域有所突破。他的父母为他感到自豪。

　　【参考范文】

　　Jack used not to be interested in chemistry，but his parents thought he was supposed to learn chemistry well.In a lesson in a lab，after he observed the reaction of substances，he changed a lot.The more he learned chemistry，the more interested he was in it.Now his aim is to be a chemist and make a breakthrough in the area of chemistry.His parents are proud of him.