alertness
US /əˈlɝːt.nəs/
UK /əˈlɝːt.nəs/
名詞
1.
警戒心
the state of being ready to see, understand, and act in a particular situation:
例:
•
One study found that the strongest factor influencing driver alertness was the time of day.
Lingolandでこの単語を学ぶ