I set my alarm clock for 4:30.

我把闹钟定在4:30。

I set the alarm clock for 7 o'clock.

我把闹钟定在7点钟闹响。

He tried to muffle the alarm clock by putting it under his pillow.

他把闹钟塞在枕头底下，想减低声音。

If he set his alarm clock for midnight, it would wake the whole house.

如果他把闹钟设定在午夜，铃声会把全家人都吵醒。

Put your alarm clock far away from your bed.

把你的闹钟放在远离床的地方。