保安在夜间巡逻时发现了可疑人物。
The guard spotted a suspicious person during his nightly ___prowl.
小偷在夜间悄悄地在街上徘徊寻找目标。
The thief ___prowled the streets at night looking for targets.
我听到有只猫在花园里悄悄走动。
I heard a cat ___prowling quietly in the garden.
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