The main thing to remember is to switch off the burglar alarm.

最要紧的是记住关掉防盗报警器的开关。

《牛津词典》

The main spring of the alarm clock is broken.

闹钟的簧断了。

《新英汉大辞典》

One of the main goals of the Hornet is to reduce the false alarm rate for target acquisition, House says.

House说。House说，Hornet的主要目标之一是减少目标获取的错误报警率。

youdao

But perhaps the main cause for alarm is that, if adopted, the proposal would add to the ongoing, incremental subversion of the rights suspects have traditionally enjoyed.

ECONOMIST: The law