[mass noun]temporary unconsciousness caused by a blow on the head. The term is also used loosely of the after-effects such as confusion or temporary incapacity.
(头部被击导致的)暂时知觉丧失;脑震荡。
a violent shock as from a heavy blow
猛击;剧烈震动;震荡
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the ground shuddered with the concussion of the blast. 地面由于爆炸的冲击而震动。
"late Middle English: from Latin