are on the prowl. 一步步靠近
Another predator is on the prowl. 还有掠食者在游弋
Further south, other bigger predators prowl the tundra. 在北极苔原更远的南边有更大的掠食动物出没
Like packs of sharks, they're on the prowl for sleeping cichlids. 它们像是一群鲨鱼 一边游一边寻找熟睡中的慈鲷