ሳይንስየፈጠራ ሳምንት To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስYohannes Geberegziabher5 ሰኔ 2011ረቡዕ፣ ሰኔ 5 2011https://p.dw.com/p/3KIJJማስታወቂያ