C (反擊) 反击 fan3ji1
counter-attack/ fight back/ strike back/ beat back
zurückschlagen,Gegenangriff

D (回擊) 回击 hui2ji1
strike back
zurückschlagen

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Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

回 回 return, turn around / a time
擊 击 strike, hit, beat / attack, fight

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from CC-CEDICT under a Creative Commons Attribution-Share Alike 3.0 License