Guìyáng； Guiyang (capital of Guizhou Province, China)

mailbox； postbox； email box； email address； letterbox； mail drop

direct selling； direct sales

self-taught； self-educated； teach oneself； self-educate； study independently； study on one's own； self-study； self-learning

office software

customer relationship management

personalized/individual service

see clearly； understand thoroughly； perceive； discern； comprehend； grasp； fathom； penetrate

precision marketing

customer satisfaction