But even a mild concussion is a concussion.

但即使是轻微的脑震荡也是脑震荡。

The department says the symptoms were similar to a mild concussion.

国务院称他的症状类似于轻度脑震荡。

He's suffered both a mild concussion and hypothermia, either of which could result in memory loss.

他有轻微脑震荡，体温也过低，两者都可能导致失忆。