三是精通专业技术，如国际贸易、航运、航海、物流、机械、工程、产品加工等知识；
The third, he should be knowledgeable of relative professional techniques, such as international trade, shipping, navigation, logistics, machines, engineering, products processing, etc.
因此，国际贸易以原材料（如小麦、木材和铁矿石）和加工商品（如肉类和钢铁）为主。
International commerce was therefore dominated by raw materials, such as wheat, wood and iron ore, or processed commodities, such as meat and steel.
当前国际贸易中最大的困难十非关税壁垒，如进口配额限制、出口管制。
The major difficulties in international trade today are the non-tariff measures, such as quotas export controls.
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