Variable
${\mathit{QG}}_{\mathit{mdjv}}$	The quantity of product j delivered from manufacturer m to distribution center d by vehicle v
${\mathit{QA}}_{\mathit{drjv}}$	The quantity of product j delivered from the distribution center d to the store r by vehicle v
${\mathit{QB}}_{\mathit{daj}}$	The quantity of product j disinfected in the distribution center d in the disinfection and sterilization center a
${\mathit{QC}}_{\mathit{arjv}}$	The quantity of product j delivered from the disinfection and sterilization center a to the store r
${\mathit{QE}}_{\mathit{rcjv}}$	The quantity of product j delivered from the store r in region c by vehicle v (online sales)
${\mathit{QP}}_{\mathit{rcj}}$	The quantity of product j sold at the store r in region c (in-person sales)
${\mathit{IG}}_d$	It is equal to 1 if the distribution center d is constructed, otherwise it is 0
${\mathit{IA}}_a$	It is equal to 1 if the disinfection center a is constructed, otherwise it is 0
$Y_r$	It is equal to 1 if the store center r is constructed, otherwise it is 0
$k_v$	It is equal to 1 if a v-type vehicle is used, otherwise it is 0
$n_v$	The number of v-type vehicles used
${\mathit{ve}}_j$	Online sales price of the product j
${\mathit{vp}}_j$	In-person sales price of the product j
${\mathit{de}}_{\mathit{rcj}}$	Online demand for product j by region c and store r
${\mathit{dp}}_{\mathit{rcj}}$	In-person demand for product j by region c and store r
${\mathit{TDM}}_{\mathit{mdj}}$	Delivery time of product j from manufacturer m to distribution center d
${\mathit{TDG}}_{\mathit{drj}}$	Delivery time of product j from distribution center d to store r
${\mathit{TDA}}_{\mathit{arj}}$	Delivery time of product j from disinfection and sterilization center a to store r
${\mathit{TDC}}_{\mathit{rcj}}$	Delivery time of product j from store r to region c in online sales