index of terms of trade for exports

例句：

1. 1. The index ofterms of trade for exportshas been declining recently.
   最近出口贸易指数一直在下降。
2. 2. Thisindex is used to measurethe performance of the export sector.
   这个指数是用来衡量出口部门的绩效的。
3. 3. The decline in the index indicates aslowdown in global trade.
   指数的下降表明全球贸易正在放缓。