alarm clock的复数形式怎么写？

I set my alarm clock for 4.30.我把闹钟定在4点半。I set the alarm clock for 7 o'clock.我把闹钟定在7点钟闹响。an alarm clock with a luminous dial夜光闹钟...

alarm clock的音标：alarm clock的英式发音音标为：[ə'lɑ:m klɔk]alarm clock的美式发音音标为：[ə'lɑrm klɑk]...

n.闹钟...