foreign commerce, trade

engage in international trade

strengthening, intensification, buildup, reinforcement, augmenting

to strengthen

relationship, relation / involvement, participation / personal connection, family relationship / romantic relationship

be related / be romantically involved

(historical or contemporary) any of several kingdoms, empires, or states of the Chinese people

the central part of a country, historically, commonly known as the capital city or the main region, where an emperor or other ruler resides / something within a country

Short for 中国地方 (Chūgoku chihō): the Chūgoku region of Japan

a surname