alertness
US /əˈlɝːt.nəs/
UK /əˈlɝːt.nəs/
1.
警戒心
the state of being ready to see, understand, and act in a particular situation:
:
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One study found that the strongest factor influencing driver alertness was the time of day.
警戒心
the state of being ready to see, understand, and act in a particular situation: