vigilance
noun [ U ] uk/ˈvɪdʒ.əl.əns/ us/ˈvɪdʒ.əl.əns/
警觉；警戒；警惕
more careful attention, especially in order to notice possible danger
The police said that it was thanks to the vigilance of a neighbour that the fire was discovered before it could spread. 警方说多亏了一位邻居警觉才在火灾蔓延之前发现了火情。