In the beginning or period. Such as the initial stage. Such as: initial impression.
Concise explanation
[initial; First; Original; [at the beginning] the beginning or period.
Primitive period
Innovation customization
detailed description
The earliest period; At the beginning.
Ai Qing wrote a poem on colored paper: "The branches cast the first fallen leaf, and the air is like iced juice." Sun Li's Xiu Lu Ji Xi Meng: "In the first few days, I got a lot of comfort in my heart." Hu Cai's preface to In Peaceful Days: "When this negative image first appeared in his mind, he was just an ordinary bureaucrat divorced from the masses and reality."