1. Words about making friends include: friendship between golden orchid, friendship between bamboo and horse, friendship between heart and heart, friendship between gentlemen, friendship between cars and hats, friendship between commoners, and friendship in forgetful years.

2. Jinlanzhijiao, a Chinese idiom, pinyin is jīn lán zhī jiāo, which means friendship as solid as gold and stone.

3. Zhumazhi, a Chinese idiom, pinyin is zhú mǎ zhī jiāo, which means a good friend since childhood.

4. Heart-to-heart acquaintance refers to a friend who talks about everything and confides in one's heart.