የወጣቶች ዓለም አቀፍ የሳይንስና ኢንጂነሪግ ዉድድርTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoTekle Yewhala12 ግንቦት 2007ረቡዕ፣ ግንቦት 12 2007https://p.dw.com/p/1FTODማስታወቂያ