萨姆(Sam)买不起他极想要的那种照相机，因为那相机太贵了。
【正确答案】Sam could not afford (to buy) the camera he longed for because it was too expensive.
【答案解析】“买不起”的英语表达是“can't afford sth. /to buy sth. ”。“极想要……”应译成英语动词短语“long for sth. ”。