n.  警报器

n.  惊恐，惊慌

v.  使不安，使恐慌

• alarming   a. 令人担忧的；令人恐慌的

  ≈ disturbing

• in alarm  惊慌地

• raise/sound the alarm  发出警报

• Trigger its built-in alarm system at once.

  内置报警系统

• If they detect something wrong while the system is armed, they'll transmit a wireless alert signal to a base station that will then raise the alarm. 发出警报 

• He'll need to be jamming you at this point, as a broken window or opened door would normally release the alarm. 引发警报

• A burglar has to continuously jam the wireless security device to avoid triggering the alarm, both inside and outside the house. 触动警报器

• Wireless devices will transmit signals so as to activate the alarm once something wrong is detected. 发出警报

• It sounds quite alarming. 听起来令人恐慌 

• This fall, David Aderhold, the chief of a high-achieving school district near Princeton, New Jersey, sent parents an alarming 16-page letter.

  送去了一封惊人的长达16页的信

• I don’t want to alarm you, but I can’t find the key. 我不想吓你，但我找不到钥匙了。

• The rainforest is disappearing at an alarming rate. 热带雨林在以惊人的速度消失。

BrE /əˈlɑːm/

NAmE /əˈlɑːrm/