However, if you do not feel comfortable using only first names, it is quite acceptable to be more formal.
不过, 你如果觉得直呼其名不好, 尽可用比较客气的称呼。
He spoke of them casually and familiarly by their first names.
他谈起他们时只用教名，语气随便而且很热乎。
She greeted them by their first names in a familiar way.
她和他们打招呼时亲切地直呼其名。
They often use first names upon meeting people for first time.
他们经常在头一次见面时就直呼其名。
His first names are Peter George.
他名叫彼得乔治。
Foreigners tend to have long names, but usually we only need to call them by their first names.
外国人的名字较长，不过一般只叫他们的本名。
Please call me Lois. First names are more friendly than last names.
请叫我伊洛丝 吧，称呼名子比称呼姓要更亲切一些。
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