A casual acquaintance, a friend of life and death, a friend in need, a friend who cares about bags, and a nodding acquaintance.

First, casual acquaintances

Explanation: average: average, average. A friend I don't know very well

From: Lu Xun's Letter to Zhang Tingqian: Either you don't communicate at all, or you are a casual acquaintance.

Second, the difference between life and death [sh ē ng s ǐ zh and Ji ā o]

Explanation: the difference between life and death.

Said by: preface to Hu Cai: I am deeply troubled by the serious differences between Lao Yan and Liang Jian, two old comrades who have been friends for life and death.

Third, a friend in need [South China zh and ji ā o]

Interpretation: Jiao: Friendship, friends. Friends who have experienced hardships together.

From: Guo Moruo's Impression of Nanjing XVI: However, thanks to these blows, you turned iron into steel and made friends in need.

Fourth, friendship with Bao.

Explanation: In the Spring and Autumn Period, Guan Zhong and Bao were the most familiar people in Qi Dynasty. Later, it was often compared to a friend with deep friendship.

From: Spring and Autumn Period. Liezi Li Ming: "The parents who gave birth to me know me, and Bao Shu also."

My parents gave birth to me, but Uncle Bao knows me.

Verb (short for verb) A nodding acquaintance.

Explanation: it means that the friendship is very shallow, and you just nod your head when you meet.

Said by: "A Morning in Shanghai" Part I: "If you say nothing, there will be one hundred children and eighty children. Nodding can't be counted. "