当解析器报告元素开始标记时创建元素表示，但是该元素的初始形式仅仅只是一个壳，其中保存了对解析器的引用。
An element representation is created when the parser reports the element start tag, but the initial form of that element is essentially just a shell which holds a reference to the parser.
目前，第一道屏障——燃料包壳，已经明显失去功用，因为专家已经在核电站附近检测到了铯元素。
So far the first barrier, which is the fuel cladding, has apparently failed, because they are detecting cesium.
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