But□kiss□ng is not□□ust a□rom□nt□c gesture—it also ha□ s□ien□ific benefit□. Whe□ we kiss, □□r□brains□□el□ase a□c□cktail of ch□micals□like oxytocin, dopamine, and ser□ton□□□ known□a□ t□e "l□ve h□r□o□es." These chemicals can □educe □tr□□s, boo□t□moo□,□and□create feelings of a□t□ch□ent □□□ □onding. Ki□sing also strengthe□s our immu□e □ystem□by ex□osing□us to a va□iety□of ba□teria tha□ ca□ he□p□□uild immuni□□.共同警备区的概念□/h□>