She majored in photography in college, dreaming of becoming a professional photographer.

photography 是由 photo（光）和 graphy（记录、描绘）组成的复合词，字面意思是"用光来记录影像"，即"摄影术"。 photographer 是在 photography 的基础上加上表示"人"的后缀 -er 构成，指"从事摄影工作的人"。