Sie suchten nach: rotary warning light (Englisch - Chinesisch (Vereinfacht))

warning lights
警兆

this should flash red warning lights to all of us and activate our utmost vigilance against the scourges of racism and xenophobia.
这应向我们所有人闪起警告的红灯，促使我们对种族主义和仇外心理的祸害保持最高度的警惕。

as a result of these disappearances, it has been decided that in addition to the existing security measures (24-hour supervision, cctv cameras and door warning lights) an extra security firm should be hired to carry out surveillance.
由于发生这些失踪事件，有关方面决定除了现有的安全措施之外（24小时监管、cctv摄像机和大门警示灯），还应另外聘请保安公司执行监视任务。