zài / dà / jiā / xīn / lǐ / xiào / zhǎng / yì / yán / jiǔ / dǐng / shuō / guò / de / huà / cóng / lái / bú / huì / gǎi / biàn

在大家心里，校长一言九鼎，说过的话从来不会改变。

In everyone's eyes, the principal's word carries great weight and never changes.