alertness
US /əˈlɝːt.nəs/
UK /əˈlɜːt.nəs/
名词
警觉性, 机敏
the state of being watchful and quick to act; readiness
示例:
•
The guard maintained a high level of alertness throughout his shift.
警卫在整个轮班期间保持高度警惕。
•
Coffee can improve your mental alertness.
咖啡可以提高你的精神警觉性。