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"