较不发达国家在世界贸易中所占份额正在下降，与发达国家的贸易条件也正在不断恶化。

较不发达国家在世界贸易中所占份额正在下降，与发达国家的贸易条件也正在不断恶化。

The share of the less-developed countries in world trade is decreasing. Their terms of trade with the developed countries are constantly deteriorating.