With the ringing of the alarm, the 600pupils evacuated the building in three minutes. Every one went back to class, proud and pleased. An hour later, the recess buzzer sounded.

• 当警报响起来的时候，600名学生在三分钟内搞到大楼外面。大家又心满意足地回到班上。一小时后，下课铃响了。