initial
What does the initials mean?
At first; Prefix
Initial letter; The first letter of a Chinese syllable
Sign with one's initials
Marginal primitive cell
Marginal protocell [seen in plants] The body is initially static, and the spring is initially unstretched.
At first, the object was stationary and the spring was not stretched. Embryonic primitive cell
At first, the embryonic primordial cells went well.
At first, everything went well. This is very familiar to beginners.
This is familiar to newcomers.