Translate the following sentences into English with the help of the words and expressions given in brackets. 安迪·沃霍尔被认为是“波普艺术”的先驱。从早年开始,沃霍尔就对摄影和绘画产生了浓厚的兴趣。大学毕业后,他找到了一份工作,为几家杂志做插图画家,但他真正的艺术生涯起步于 20 世纪 50 年代。(pioneer, from an early age, illustrator, take off)