A: The existence of a trade imbalance between the two countries has an intimate connection with the countries 'economic structures and comparative production costs, and is not a problem that can be completely ameliorated in a short period.
答：兩國間貿易差距的存在，與兩國的經濟結構，以及生產成本的比較，有密切關係，不是在短期間所能完全改善的。