"Alertness" is a state of being watchful and attentive.
n. 警戒，机敏, 戒心
| 单词 | alertness |
|---|---|
| 音标 | [ə'lɜ:tnəs] [ə'lɜ:tnəs] |
| 释义 | n.["警戒，机敏","戒心"] |
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