戒备的

The patrol police on duty are on the alert against any possible disturbances.

"值班巡警处于状态,随时准应付任何可能发生的骚乱。"

Warnings of an enemy attack forced the troops onto the defensive.

敌军显示出进攻的迹象，得进入状态。

The dog jealously guarded its bone.

那地看管着它的骨头。