How to say "逐渐蔓延" (zhú jiàn màn yán) in Chinese dialogue

zhújiànmànyán

as the infection kept spreading.

Grammar Patterns
INTERACTIVE SCRIPT TIMELINE
LINE 0114:43
kuì
làn
zhī
chù

I could only watch helplessly as the infection

LINE 0214:44
PLAYING SCENE
zhú
jiàn
màn
yán

as the infection kept spreading.

LINE 0314:47

I...

Show Information
Source MediaTV Series
Season & EpisodeS1 E24
Timestamp14:44
TMDB ID289209