对女士的称呼很难把握，如果您因太随便而失礼，后果很难预料。
Addressing women can be tricky. If you insult a woman by being too informal, the results can be problematic.
对不认识的人要称呼他们的姓：用他们的头衔(先生、女士、博士等)加上他们的姓。
Use last names with people you do not know: Address people using their title (Mr, Ms, Dr) and their last names.
对不认识的人要称呼他们的姓：用他们的头衔(先生、女士、博士等)加上他们的姓。
Use last names with people you do not know: Address people using their title (Mr, Ms, Dr) and their last names.
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