Gb	Eng
他大学时的专业是国际贸易。	He majored in international commerce in college.
进出口的高关税是国际贸易的障碍。	Heavy duties on imports and exports are a barrier to international trade.
1929年的经济大萧条摧毁了国际贸易.	The great financial crash in 1929 ruined international trade.