How to say "但不知出于什么原因" (dàn bù zhī chū yú shén me yuán yīn) in Chinese dialogue

dànzhīchūshénmeyuányīn

But for reasons unknown,

Idioms & Colloquial Expressions
INTERACTIVE SCRIPT TIMELINE
LINE 0124:29
lián
jiā
shǔ
qiān

to sign the consent.

LINE 0224:30
PLAYING SCENE
dàn
zhī
chū
shén
me
yuán
yīn

But for reasons unknown,

LINE 0324:32
qín
míng
diū
xià

he left the hospital alone,

Show Information
Source MediaTV Series
Season & EpisodeS1 E5
Timestamp24:30
TMDB ID283950