1. Alexander Graham Bell was a teacher of the deaf. He did not know much about electricity.
    亚历山大·格雷厄姆·贝尔曾经当过耳聋学生的教师。他对电学所知甚少。

2. In his basement laboratory in London, a bacteriologist, Dr. Alexander Fleming, was searching for a substance that would kill deadly bacteria.
    当时细菌学家亚历山大·佛来明博士正在地下试验室里研制一种能够杀灭致命细菌的物质。