How to say "一战的时候就研究出来了" (yī zhàn de shí hòu jiù yán jiū chū lái le) in Chinese dialogue

zhàndeshíhòujiùyánjiūchūláile

was developed back in World War I.

Idioms & Colloquial Expressions
Grammar Patterns
INTERACTIVE SCRIPT TIMELINE
LINE 0137:37
zhè
ge
dōng
西

This stuff...

LINE 0237:37
PLAYING SCENE
zhàn
de
shí
hòu
jiù
yán
jiū
chū
lái
le

was developed back in World War I.

LINE 0337:40
qíng
bào
guān
jǐng
chá
sōu
chá
guān

Intelligence agencies, police, and investigators

Show Information
Source MediaTV Series
Season & EpisodeS1 E19
Timestamp37:37
TMDB ID309609