n.矛尖；突击队的先遣队；攻击的最前线
v.做先锋；在前面带头做先锋
A spearhead of tanks led the infantry attack. 坦克先遣队引导步兵进攻。
The tanks spearheaded the offensive. 坦克在那次进攻中打头阵。
You will spearhead the sales campaign. 你当促销活动的先锋。
