The general worldwide decline in trade barriers, such as customs duties and import quotas, is surely one explanation.

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。

youdao

Most of the spending went on farm subsidies under the common agricultural policy (CAP); much of the revenue came from customs duties and farm-import levies.

欧洲预算的大部分支出都根据共同农业政策用于农产品补助，而大部分收入都来自关税和农业进口税收。

youdao

Has cancelled the export taxes of 35 kinds of products and has cancelled the import tariff of steel plate, and drived the customs duties of wheat and the cement down.

中国取消35种乳制品的出口关税，取消了钢板的进口关税，并下调了小麦和水泥的关税。

youdao

Import quotas have largely been replaced with customs duties, and subsidies, tax breaks and other special favours for farmers scaled back.

ECONOMIST: South African farming

And when the center supplied computers to various teams, some got stuck in customs because no one had checked up on import duties.

WSJ: Mari Carmen Ram��rez | Derivative Works No More | Cultural Conversation by Judith H. Dobrzynski