戒备

The whole navy was placed on full alert.

整个海军都处于全面戒备状。

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

敌军显示出进攻迹象，部队不得不进入戒备状。

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

"巡警处于戒备状,随准备应付任何可能发乱。"

The dog jealously guarded its bone.

那狗戒备地看管着它骨头。