"An inteligent approach is crucial, - new words can be completely understood and permanently remembered only as symbols of vital ideas, never if memorized in long lists of isolated forms."
I seem to think that omissions are so much. Is the sentence grammatically correct?
"An intelligent approach is crucial. "
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"An intelligent approach is crucial. New words can be completely understood and permanently remembered only as symbols of vital ideas, but never if memorized in long lists of isolated forms."