تعلم الانجليزية: Canadian Professor Aims to 'Light Up the World'

تعلم الانجليزية: Canadian Professor Aims to 'Light Up the World'

Ahmad

4:30 ص

0 comments

This is Gwen Outen with the VOA Special English Development Report. A light emitting diode , or L.E.D ., is a device that shines when elect...

تعلم الانجليزية: Canadian Professor Aims to 'Light Up the World'

تعلم الانجليزية: Canadian Professor Aims to 'Light Up the World'

Ahmad

4:30 ص

0 comments

This is Gwen Outen with the VOA Special English Development Report. A light emitting diode , or L.E.D ., is a device that shines when elect...