ሳይንስየትምህርትን ጥራት ማሳደግ ላይ ያለመ የትብብር መድረክ To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoሳይንስGetachew Tedla HG21 መስከረም 2012ረቡዕ፣ መስከረም 21 2012https://p.dw.com/p/3Qedhማስታወቂያ