low pressure alarm

例句：

1. 1. The low pressure alarm went off at 7:00 p.m.
   低压警报在晚上7点响起。
2. 2. The weather forecast said there would be a low pressure system in the area.
   天气预报说该地区将有低压系统。
3. 3. Low pressure systems are often associated with storms.
   低压系统通常与风暴有关。