2. Thirty is a substitute for the number thirty in China. Before the founding of the People's Republic of China, it was a commonly used Chinese character with high frequency in chronology and counting. With the development of Chinese and the wide spread of Arabic numerals, the word gradually faded out of people's sight.
3. Poetry:
Qingzhou Shou Chang
The robe is still there and the collar is still warm.
I can't bear to act rashly when I meet you again, and there are old traces of loving mothers on it.