Niger is one of the poorest countries in the world, receiving close to $2 billion a year in official development assistance.

尼日尔是世界上最贫穷的国家之一，每年接受近20亿美元的官方发展援助。

This is development aid, referred to technically as official development assistance (ODA).

这是发展援助，技术上称为官方发展援助 (ODA)。