Phenomena in Tang and Song Poetry

1, and the examples of Du Fu and Lu You are cited to illustrate that "phenology varies from place to place and from time to time".

2. Because "Lu You is paying attention to phenology. He not only pays attention to phenology, but also uses it to predict farming time. "

3. The word "Ye" cannot be removed. The word "leaf" here is a continuation of the above, because people in Tang and Song Dynasties sang "early spring" in phenology, and besides "picking green trees", there are also "migratory birds", so the word "leaf" was used.

4. "Must" cannot be deleted. "Must" plays an important role here, emphasizing that "phenology varies with time and place".