老师不得不干预来制止这场打斗。

The teacher had to intervene to stop the fight.

他总是喜欢在朋友的争论中干预。

He always likes to intervene in his friends' arguments.

政府经常干预经济以稳定它。

Governments often intervene in the economy to stabilize it.

医生决定干预以挽救病人的生命。

The doctor decided to intervene to save the patient's life.

有时候最好不要干预别人的争论。

Sometimes it's best not to intervene in other people's arguments.