A concussion is a traumatic brain injury that alters the way a person's brain functions. Their effects are usually temporary, but they can include headaches and problems with your memory, balance, and coordination. They often occur from a blow to the head, but they can also happen from a strike anywhere else due to the head and upper body being violently shaken from the force.

　　“脑震荡”是种创伤性的脑部损伤，它会改变一个人大脑的运作方式。这些影响通常只是暂时性的，但可能会出现头痛、失忆、平衡感和协调能力上出问题。脑震荡通常是头部受到重击而引发，但也有可能是由于头部或上半身受到猛烈摇晃后，进而使得身体其他部位受到重击所致。

　　脑震荡是什么

　　学习重点：

　　1.concussion 震动、冲击、脑震荡

　　concussion (n.) 震动、冲击、脑震荡

　　2.traumatic 创伤的

　　traumatic (adj.) 创伤的

　　trauma (n.) 伤口、创伤

　　3.injury 伤害

　　injury (n.) 伤害

　　injure (v.) 伤害

　　endure (v.) 忍受

　　4.temporary 临时的

　　temporary (adj.) 临时的