alertness

名詞

1. 1

   警覺、警戒、戒心

   The guards maintained a high level of alertness throughout the night.

   警衛整夜都保持高度警覺。

2. 2

   機敏、清醒、專注

   A short nap can improve your alertness for the rest of the day.

   小睡一下可以讓你接下來一整天更清醒專注。