something exchanging things with something else means that something taking one kind of thing from that something else and giving off another kind of thing to that something else
giving is sharing. another_way_to_say_separates_things is divides_objects. separated_thing is divided_thing. christmas is time_for_exchanging_gifts. exchanging_greetings is social_activity. space is what_between_else. tradeoff is exchange. telephone_exchange is tangible_thing. parties is for_having_fun_with_other_people. exchanging_greetings is dialogue.