ሳይንስለህጻናት ኦክስጅን መጥኖ የሚሰጥ መሳሪያ የሰሩ አሸንፈዋል To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስTesfalem Waldyes Erago16 መስከረም 2011ረቡዕ፣ መስከረም 16 2011https://p.dw.com/p/35WoQማስታወቂያ