a·lert¹/ə`lɜt; əˈlɜːt/ adj 1 always watching and ready to notice anything strange, unusual, dangerous etc 警惕的，警觉的: + to Cyclists must always be alert to the dangers of overtaking parked cars. 骑脚踏车的人必须对超越停放车辆的危险时刻保持警惕。 2 able to think quickly and clearly 机警的，机敏的: I knew that I had to remain wide awake and alert. 我知道我必须保持十分清醒与机警。