(1)先生，阁下(respectful form of address to a man)：What can I do for you，～? 先生，我能为您做点什么? Yes，～. 是的，先生(长官)。Dear S～/S～s 亲爱的先生/诸位先生(用在正式信函的开头);〖反〗madam;

(2)爵士或男爵的尊称(放在名字前)(title put before a man's first name to show that he is a knight or baronet)：Sir Walter Scott/Sir Walter 沃尔特爵士(不能说Sir Scott);〖反〗Lady