I want to be both an artist and an engineer.
我又想当艺术家又想当工程师
both .and 两个都 ,不一定非要翻译出来.
其实I want to be both an artist and an engineer.的直意是；我想当两个一个艺术家一个工程师
意义就是；我又想当艺术家又想当工程师