People who have concussions often trouble thinking or remembering.
患腦震蕩的人通常存在思考和記憶障礙.
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Concussions also make a person feel very tired or angry.
腦震蕩也會使人感覺疲倦或憤怒.
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Some concussions are more severe than others.
某些腦震蕩后果較常規(guī)更為嚴(yán)重.
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