How to say "究竟是干什么用的" (jiū jìng shì gàn shén me yòng de) in Chinese dialogue

jiūjìngshìgànshénmeyòngde

or what they were used for

Idioms & Colloquial Expressions
Grammar Patterns
INTERACTIVE SCRIPT TIMELINE
LINE 0131:50
méi
yǒu
rén
zhòng
shì
zhè
xiē
shè
bèi

no one paid attention to these devices

LINE 0231:52
PLAYING SCENE
jiū
jìng
shì
gàn
shén
me
yòng
de

or what they were used for

LINE 0331:54
zhè
zhù
dìng
zhōng
duì

This meant the Doolittle Squadron

Show Information
Source MediaTV Series
Season & EpisodeS1 E39
Timestamp31:52
TMDB ID309609