alarm/ ə'lɒːm /

1.noun [u] 
(anxiety) 惊慌

2.noun [c] 
(warning device) (in house,car etc) 警报

3.noun [c] 
(on clock) 闹钟

4.vt.[+person] 
使惊慌

to raise/sound the alarm
拉响警报
to view {or} regard sth with alarm
警觉地看待某事物