男性患儿,5岁,误将花生米吸入气管,胸部平片见右侧肺透过度增高,肺纹理变细,提示右侧肺气肿, 吸气时照片示纵隔向右侧移位,呼气时照片示纵隔位置恢复正常,请判断花生米位于气管何部位 ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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