vanguard [ˈvængɑ:d]

以下由轻松背单词网站提供

n.前锋，先锋，先驱

the leading units moving at the head of an army

They are in the vanguard of technological advance.他们是技术发展的先导。
In a way they played a vanguard role.在某种意义上说，他们起了先锋的作用。