短句聽寫
hints:
Africa
Sahel
A lot of trees are dying in Africa's Sahel region, and a new study says climate change caused by humans is to blame.
在非洲撒赫勒地區(qū)，很多樹木正在不斷死亡，最新研究表明，導致樹木死亡的真正原因是氣候變化。