xué / xiào / dìng / qī / jǔ / xíng / fáng / kōng / bì / nàn / yǎn / liàn / jiào / dǎo / xué / shēng / bǎo / chí / lěng / jìng

学校定期举行防空避难演练，教导学生保持冷静。

The school regularly holds air-raid shelter drills and teaches students to remain calm.