የተፈጥሮ ሀብት ፣ የሥነ ቴክኒክ ሽግግርና ዕድገትTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoTekle Yewhala23 መጋቢት 2007ረቡዕ፣ መጋቢት 23 2007https://p.dw.com/p/1F1BOማስታወቂያ