最大的挑战是在撒哈拉以南非洲地区。

The biggest challenge is in Sub-Saharan Africa.

youdao

答案可能会令你大吃一惊：撒哈拉以南非洲地区！

The answer may surprise you: It is sub-Saharan Africa!

youdao

答案可能会令你大吃一惊：撒哈拉以南非洲地区！

The answer may surprise you: It is sub-Saharan Africa!

youdao