fàn wéi shuō qīng chǔ duì fāng cái bú huì bǎ xiǎo wèn tí xiǎng chéng dà zāi nàn

范围说清楚，对方才不会把小问题想成大灾难。

Make the scope clear, so the other party won't turn a small problem into a big disaster.