id	keyword
cet-9107	refrigerator
cet-9107	odor
cet-9107	gas
cet-9107	photocatalyst
cet-9107	tio2
cet-9107	deodorization
cet-9107	concentration
cet-9107	rate
cet-9107	surface
cet-9107	air
cet-9107	reaction
cet-9107	effect