"siren" in Chinese (Simplified)
警报器汽笛
Definition
“Siren”指的是救护车、警车、警报系统或船只发出的响亮警示声，也可以指发出这种声音的装置。
Usage Notes (Chinese (Simplified))
这个词最常指急救车、警车等发出的警报声，如 'an ambulance siren'、'police siren'。也可指大楼警报或空袭警报。不要和希腊神话中的 'Siren' 混淆，后者通常大写或出现在文学语境中。
Examples
I heard a siren outside the hospital.
我听到医院外面有**警报声**。
The fire truck turned on its siren.
消防车打开了**警报器**。
When the siren sounded, everyone stopped working.
当**警报器**响起时，大家都停止了工作。
We were halfway through dinner when a siren went past and the whole street got quiet.
我们晚饭吃到一半时，一阵**警笛声**经过，整条街都安静了下来。
That siren has been going off all morning — I hope everything's okay.
那个**警报器**整个早上都在响——希望一切都没事。
The siren on the police car got louder as it came closer.
警车上的**警报器**随着靠近变得越来越响。