排头兵的英文：
bellwether;vanguard

bellwether是什么意思：
n. 系铃羊,前导,领导者

Leader;bellwether;initiator;pathfinder;pacesetter;pacemaker
牵头人

The degree to which the paper is censored is a political bellwether(Justine De Lacy)
对报纸审查的程度是一个政治预兆(朱斯蒂娜·德·莱西)

vanguard是什么意思：
n. 先头部队；前沿；先锋；先驱

The Communist Party is the vanguard of the working class
共产党是工人阶级的先锋队。

The Communist Party is the vanguard of the working class.
共产党是工人阶级的先锋队。

On the second day the vanguard on the right bank fell behind.
第二天，右岸的先锋部队落在后面了。

The exemplary vanguard role of the Communists is of vital importance.
共产党员的先锋作用和模范作用是十分重要的。

In the modern world the scientists are in the vanguard of all industrial development.
在现代世界中，科学家站在一切工业发展的前列。