词汇：formal

adj. 正式的；拘谨的；有条理的

相关场景

Please meet my friend Tom!(Formal introduction.)
>> 见面打招呼介绍自己并谈几句
Formal greetings:
For a more formal way to greet someone, use the model “good + [time of day]”.
>> 见面打招呼介绍自己并谈几句
Greetings! (This is quite formal and rare these days, but could be used humorously among friends.)
>> 见面打招呼介绍自己并谈几句