戒备的

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

"值班巡警处于备状态,随时准备应付任何可能发生骚乱。"

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

敌军显攻迹象，部队不得不入备状态。

The dog jealously guarded its bone.

那狗备地看管着头。