effectiveness

n.成效，效力

educated, education, educational, educationally, educationist, educator, EEC, EEG, eel, eerie, eerie (also eery), eerily, eeriness, eff, efface, effacement, effect, effect on, effective, effectively, effectual, effectually, effeminacy, effeminate, effeminately, effervesce, effervescence, effervescent, effete, effeteness, efficacious, efficaciously, efficacy, efficiency, efficient, efficiently, effigy, effing, efflorescence, efflorescent,