前驱的英文：
VAN

参考例句：

Li Dazhao was a pioneer of the Chinese revolution
李大钊是中国革命的前驱。

The onset of this disease may resemble the prodromal period of icteric hepatitis
它的发病与黄疸型肝炎的前驱期相似。

There may also be an increase in the velocity of air particles in the blast wave due to precursor action
由于前驱波的作用，爆震波中的空气粒子速度可能增加。

van是什么意思：
n. 货车；行李车；先锋；面包车；分离式座舱
prep. 从，自，来自…的

Customize a van.
定做一辆大马车

He was catapulted into the side of the van.
他被弹飞出去，撞在货车的侧面。

motor luggage van
机动行李车

mail and luggage van
邮政行李车

We were in the van of civilization.
我们是文明的先导者。