留美老师带你每日说英文第743期:脑震荡是什么

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台湾籍旅美老师今天交给我们的句子是：

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。