warning sign

US /ˈwɔːr.nɪŋ ˌsaɪn/
UK /ˈwɔːr.nɪŋ ˌsaɪn/
"warning sign" picture
1.

警告标志, 警示牌

a sign that gives a warning

:
The yellow light is a warning sign that the traffic light is about to turn red.
黄灯是交通信号灯即将变红的警告标志
There was a warning sign about falling rocks on the mountain road.
山路上有一个关于落石的警告标志
2.

警告信号, 危险信号

an event or circumstance that indicates a possible problem or danger

:
His constant lateness was a warning sign that he was losing interest in the job.
他经常迟到是一个警告信号,表明他对这份工作失去了兴趣。
Early symptoms can be a warning sign of a more serious illness.
早期症状可能是更严重疾病的警告信号