Cách sử dụng
"Deal in" is a phrase that means to do business in a particular area or to specialize in a certain type of product or service. For example, a store that "deals in" electronics means that it sells electronic items, and a person who "deals in" real estate means that they work in that industry. It can also mean to be involved in a particular activity or situation, such as "dealing in" drugs or "dealing in" political affairs.