What is friendship, what is emotion, what is friendship and what is greeting.

Friendship is the feeling between friends, pure and innocent, equivalent to iron buddies or girlfriends. Emotion is a good feeling between the opposite sex, such as love, romance, sweetness, longing for intimacy, lingering all day long, and finally getting married. Friendship is an emotion in which friendship and love are intertwined. Long-term contact between the opposite sex may start with friendship and love, and over time it will breed strange feelings and then fall in love.