The ancient glyph "Mo" is like the sunset in the vegetation, which is the original word of "dusk". Its original meaning refers to the time when the sun sets. "Mo" is also used to deny indefinite pronouns, meaning no and no one, and also used as a negative adverb, meaning no and no; It also means guessing or asking questions.
"Mo" in Oracle Bone Inscriptions, with the sun in the middle and grass around it, means that the sun sets in the west and falls among the plants, and it is getting late. The original meaning of "Mo" means that when the sun is about to set, it is the original word of "sunset". There is also the word grass on the top and sun on the bottom (Figure 4). Ancient Chinese characters were different from wood to brick, so Oracle Bone Inscriptions's word "Mo" came from Simu (Figure 1). The Western Zhou Dynasty and later generations inherited Oracle Bone Inscriptions's writing style of "Congsi". In the Han Dynasty, the second word "Mo" from the bottom up was changed to "Da", which is today's regular script. Later, the word "Mo" was borrowed to mean "no" and "no", and people specially created a word "dusk" to replace the meaning of "sunset".