1. 先生：在英语中，"先生" 可以翻译为 "gentleman"，简称为 "Mr." 或者 "Sir"。"Gentleman" 这个词还可以表示绅士。
2. 女士：在英语中，"女士" 根据婚姻状况的不同，可以翻译为 "lady"、"madam" 或 "young lady"。已婚女士可以称为 "Mrs."，未婚女士则通常称为 "Miss"。如果想要表示不确定婚姻状况的女士，可以使用 "Ms."。
3. 扩展例句：以下是几个例句，展示如何在英语中使用这些词汇。
- 例句1："However, a man usually does not shake hands with a woman unless she offers her hand first." 改写为："However, a gentleman typically does not initiate a handshake with a lady unless she extends her hand first."
- 例句2："Five men were invited, including him." 改写为："Five gentlemen were invited, including him."
- 例句3："We prefix 'Mr.' to a man's name." 改写为："We precede a gentleman's name with 'Mr.'."
- 例句4："No, they are not regretful tears. I have no regrets where this boy--this man--is concerned. He has been, and always will be, my pure joy." 保持原样，无需改写。
- 例句5："Both businesswomen, however, note that more men buy presents for their girlfriends, instead of vice versa." 改写为："However, both businesswomen observe that it is more common for men to purchase gifts for their girlfriends, rather than the other way around."
通过这种方式，我们可以确保语义保持不变，同时提高内容的质量和准确性。
