这是一张旋转椅，可以用来评估战场上遭受震荡而中耳损伤的士兵情况。
The rotary chair is used to assess middle ear injury of soldiers who may have experienced a concussion.
脑震荡是一种闭合性脑损伤，它会引起短暂的脑功能障碍。
Concussions are a type of internal head injury that causes the temporary loss of normal brain function.
五角大楼承认，在2009—2010年以前，很多可能患有隐性的创伤性脑损伤的士兵从来都没有接受过脑震荡后的头颅扫描。
By the Pentagon's own admission, many soldiers who likely suffered this invisible form of TBI were never screened for concussions prior to 2009-2010.
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