I think it's much more convenient to use the electronic dictionary. and it'
s easier for a person to master his unfamiliar words, for u can preserve the wor
ds which u look up for in ur electronic dictionary and review them again and aga
in.
Our English teacher told us, those electronic dictionary are suitable for quick-
checking. But if you want to understand the words, You'd better check so called
"Advanced dictionary" such as "Oxford Advanced Dictionary""Cambridge..."
By the way, English learners are suggested to use "english-english dictionary"