Developed countries have traditionally maintained low tariffs on primary products and much higher tariffs on semi-manufactured and manufactured goods.
发达国家历来对初级产品保持着低关税，而对半成品和制成品保持着很高的关税。
2
Import duty rates on raw materials were generally lower than those on semi-manufactured or manufactured products.
原材料的进口税率一般低于半制成品或制成品的税率。
3
Industry refers to manufacturing activities in making means of production, means of subsistence and processing semi-manufactured goods by making use of natural resources.