a united front的用法和样例：
- They are trying to form a united front.
- We must show a united front against the enemy.
- It's imperative for us to present a united front.
- We must be unified into a united front.
- It has been suggested that in order to present a united front to a threatening world, the minority should now surrender its convictions and join the majority.
- The united front is a united front for carrying on armed struggle.