concussions

People who have concussions often trouble thinking or remembering.

患脑震荡的人通常存在思考和记忆障碍.

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Concussions also make a person feel very tired or angry.

脑震荡也会使人感觉疲倦或愤怒.

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Some concussions are more severe than others.

某些脑震荡后果较常规更为严重.

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