Huaishudi.
Explanation and analysis: The next sentence of "Looking up at the bright moon" is "Looking down at my hometown". This poem talks about missing my hometown. It can also be understood as missing my familiar hometown and place. Therefore, It can be thought of as a traditional Chinese medicine, which is "Huaishu Rehmannia".
Huaishu Rehmannia is a kind of traditional Chinese medicine. Rehmannia glutinosa is the rhizome of Scrophulariaceae plant Rehmannia glutinosa or Huaiqing Rehmannia glutinosa. It is artificially processed. It is recorded in ancient Chinese medical works, "Pearl Sac" , "Compendium", "Jingyue Complete Book", etc. all mentioned the medicinal properties and functions of Rehmannia glutinosa.
Extended information:
Commonly used methods for guessing riddles are:
1. Face-off method: separate some words on the face of the riddle to fit the answer.
2. Pictographic method: Based on the characteristics of things and the structure of Chinese characters, personification and visualization are used to evoke associations and increase interest.
3. Image painting method: The answer to this puzzle is based on the overall picture meaning of the puzzle.
4. Direct harmonic method: When making the answer to a riddle, use words with the same or similar sounds to replace the words that should be used to draw people's attention away and achieve the purpose of hiding the answer.
5. Inter-harmonic method: First break up some words in the riddle and then use the homophonic sounds to connect the answers to the riddle.