短语词组短語head node selection algorithm 首節點選擇算法cluster head node 頭節點;簇首節點cluster -head node selection 簇頭節點選擇NODE head 隊列的頭部;頭結點指針lymph node head 頭部淋巴結private Node head 頭指針private Node T head 頭引用 返回 head node