spear·head /-ˌhɛd/
 矛尖,突擊隊的先遣隊,攻擊的最前線(vt.)做先鋒,在前面帶頭做先鋒


 Spear·head n. The pointed head, or end, of a spear.

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 spearhead
      n 1: someone who leads or initiates an activity (attack or
           campaign etc.)
      2: the leading military unit in an attack
      3: the head and sharpened point of a spear [syn: spearpoint,
         spear-point]
      v : be the leader of; "She spearheded the effort to find a cure
          for the disease"