当然，原因之一是像关税和进口配额等贸易壁垒在全世界范围内普遍有所减少。
The general worldwide decline in trade barriers, such as customs duties and import quotas, is surely one explanation.
他诉诸于关税和进口配额。
一个国家为阻碍某些产品的进口所采用的关税、配额和其他规定。
Tariffs, quotas, and other regulations used by one country to discourage the importation of certain goods.
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