ሳይንስየሐዋሳ ዩኒቨርሲቲ እና የፕሮፌሰርነት ማዕረግ አሰጣጥTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስTesfalem Waldyes Erago17 ነሐሴ 2009ረቡዕ፣ ነሐሴ 17 2009https://p.dw.com/p/2iijbማስታወቂያ