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。

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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。

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