(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
大约
dà yuēㄉㄚˋ ㄩㄝ
approximately; about[cedict]
十亿
shí yìㄕˊ ㄧˋ
one billion; giga-[cedict]
年前
nián qiánㄋㄧㄢˊ ㄑㄧㄢˊ
...years ago[cedict]
但
dànㄉㄢˋ
but; yet; however; only; merely; still[cedict]
再
zàiㄗㄞˋ
again; once more; re-; second; another; then (after sth, and not until then)[cedict]
过
guòㄍㄨㄛˋ
(experienced action marker); to cross; to go over; to pass (time); to celebrate (a holiday); to live; to get along; excessively; too-; surname Guo[cedict]
第一
dì yīㄉㄧˋ ㄧ
first; number one[cedict]
批
pīㄆㄧ
to ascertain; to act on; to criticize; to pass on; classifier for batches, lots, military flights; tier (for the ranking of universities and colleges)[cedict]
神经细胞
shén jīng xì bāoㄕㄣˊ ㄐㄧㄥ ㄒㄧˋ ㄅㄠ
nerve cells[cedict]
才
cáiㄘㄞˊ
ability; talent; endowment; gift; an expert; only (then); only if; just[cedict]
just; not until[cedict]
会
huìㄏㄨㄟˋ
kuàiㄎㄨㄞˋ
can; be possible; be able to; will; to assemble; to meet; to gather; to see; union; group; association[cedict]
to balance an account; accounting[cedict]
发生
fā shēngㄈㄚ ㄕㄥ
to happen; to occur; to take place; to break out[cedict]