concussion of brain

例句：

1. 1.He was in a coma after the car accident.
   车祸后他陷入了昏迷。
2. 2. The doctor advised him to take it easy and not to exert himself too much.
   医生建议他不要过度劳累。
3. 3.She fell down and hit her head on the ground, resulting in a concussion.
   她摔倒了，头撞到地上，结果得了脑震荡。