n. 

造词,倒反构词
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efficaciously,
efficacity,
efficacy,
efficatious,
efficiency,
efficiency expert,
efficient,
efficiently,
Effie,
effigurate,
相似单词
backflow,
backflush,
back-fold,
back-folding,
backform,
backformation,
back-formation,
backgammon,
backgear,
back-geared,