ሳይንስሰልፍ ለሳይንስ እና የሳይንስ የምርምር ስራዎችTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስTesfalem Waldyes Erago18 ሚያዝያ 2009ረቡዕ፣ ሚያዝያ 18 2009https://p.dw.com/p/2bxSxማስታወቂያ