Warnings of an enemy attack forced the troops onto the defensive.
敌军显示出进攻的迹象，部队不得不进入戒备状
。
Warnings of an enemy attack forced the troops onto the defensive.
敌军显示出进攻的迹象，部队不得不进入戒备状。
The dog jealously guarded its bone.
那狗戒备地看管着它的骨头。
The patrol police on duty are on the alert against any possible disturbances.
"值
处于戒备状,随时准备应
可能发生的骚乱。"
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