fog bell

例句：

1. 1. The fog bell rang at5:00 p.m.
   下午5点，雾铃响起。
2. 2. The fog bellwas a signal for the police to comeand clear the roads.
   雾铃是警察来清理道路的信号。
3. 3. The fog bell woke meup from my sleep.
   雾铃把我从睡梦中唤醒。