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1A force equal and opposite to a force giving rise to it; compare sense 2b.
2Military a military unit kept in a state of readiness for rapid deployment to counter hostile activity.
1920s; earliest use found in The New York Times.
礼仪网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。