How to say "定是孙貌发现了什么" (dìng shì sūn mào fā xiàn le shén me) in Chinese dialogue

dìngshìsūnmàoxiànleshénme

Sun Mao must have discovered something,

Idioms & Colloquial Expressions
Grammar Patterns
INTERACTIVE SCRIPT TIMELINE
LINE 0120:22
jìng
rán
suǒ
zài

with the case files of those two dead women.

LINE 0220:25
PLAYING SCENE
dìng
shì
sūn
mào
xiàn
le
shén
me

Sun Mao must have discovered something,

LINE 0320:27
men
cái
jiāng
miè
kǒu

which is why you silenced him.

Show Information
Source MediaTV Series
Season & EpisodeS1 E23
Timestamp20:25
TMDB ID289209