Zhang Qian official n. a person who holds a position of authority. development n. growing larger or becoming stronger. trade n. the activity of buying,selling,or exchanging goods or services. ● His travels to the west of China helped open up Central Asia to China.c /'sentral'eIe/④Zhang Qian official n. a person who holds a position of authority. development n. growing larger or becoming stronger. trade n. the activity of buying, selling, or exchanging goods or services