29. 非洲经济对初级产品的严重依赖 再加上非洲主要出口品在世界市场所占份额有所减少以及这些产品在世界贸易中的相对重要性有所下降 使得非洲大陆在世界贸易中所占份额大大减少 由于商品价格起伏不定 非洲对商品的依赖也使非洲的出口收益很不稳定
29. The heavy reliance of African economies on primary products, combined with the decline in Africa’s share of world markets for its main exports and the declining relative importance of these products in world trade, have largely contributed to the decrease in the continent’s share of world trade. Commodity dependence has also resulted in Africa’s export earnings being more volatile due to volatility in commodity prices.