alarm clock

例句：

1. I was so sleepy, I thought it was my alarm clock.
   那個時候我很困，所以以為是鬧鐘在響。
2. I set the alarm clock.
   我設定鬧鐘的時間。
3. He needs an alarm clock.
   他需要一個鬧鐘。
4. I didn't wake up until I heard the alarm clock.
   直到聽到鬧鐘的鈴聲我才醒來。

英文解釋：

名詞 alarm clock:

1. a clock that wakes sleeper at preset time
   同義詞：alarm