她将带头推动社区环保项目。

She will ___spearhead the community's environmental protection project.

博物馆展出了一个铁制的矛头，据说是古代战士使用的。

The museum displayed an iron ___spearhead believed to be used by ancient warriors.

他是这次环保运动的先锋人物。

He was the ___spearhead of the environmental movement.