当在介绍两人是朋友时,应该是Kangkang and I还是I and Kangkang?为什么?

应该用Kangkang and I 表示礼貌.
the one 指代特指的同一类：The book is the one you want to buy.
another:3者或3者以上的 “另一个”,形容词或代词：
I don't this coat.Show me another.(暗指有3件以上的衣服.)
Please give me another apple.
the other:1.(二者中的“另一个”) He has two sons,one is a teacher,the other is a doctor.
2."其余的,其他的"（特指）,接名词复数：Can you see the other girls in my class?
others:名词,“其他的人、物”（泛指）,常构成some...others 短语：
Some boys are running,some are reading ,others are singing.