戒备

The whole navy was placed on full alert.

整个海都处于全面戒备状态。

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

"值班巡警处于戒备状态,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.

示出进攻迹象，部队进入戒备状态。

The dog jealously guarded its bone.

那狗戒备地看管着它骨头。