求翻译：对外贸易是我国对外经贸关系的具体体现，发展对外经济贸易，增进与世界各国的友谊和合作，是我国的一贯方针。改革开放以来，我国与各贸易伙伴的贸易关系稳定发展，对外贸易不但成为我国经济持续、健康发展的重要支柱，也成为我国与各个国家和地区保持良好经贸关系的重要标志。是什么意思？

Foreign trade is a concrete manifestation of China's foreign trade and economic relations, development of foreign economic relations and trade, promote friendship and cooperation with the countries of the world, is China's consistent policy. Since reform and opening up, China's trade relations with trading partners and stable development, foreign trade has not only become an important pillar of China's continued economic development, health, has also become our country's good economic and trade relations with the countries and regions important flag.