vanguard GRE专八

1.They are in the vanguard of technological advance.

他们是发展的导。

2.the prototype was in the vanguard of technical development.

该原型处于发展的地位。

3.In a way they played a vanguard role.

在某种意义上说，他们起了的作用。

4.It has vanguard technology of friction welding and chroming and so on.

具磨擦焊接和镀铬等进生产工艺。