一把钥匙开一把锁
[词典] open different locks with different keys; use different methods to deal with different people [problems];
[例句]做思想工作时，必须学会“一把钥匙开一把锁”，因为适用于一个人的方法不一定适用于另一个人。
In Ideological work, we must learn to open different locks with different keys because a method that answers with one person may not answer with another