xiào / zhǎng / zài / huì / shàng / zhèng / gào / dà / jiā / ān / quán / wèn / tí / bù / néng / diào / yǐ / qīng / xīn

校长在会上正告大家，安全问题不能掉以轻心。

At the meeting, the principal sternly warned everyone not to take safety issues lightly.