You and your friends keep an eye out. If there's any trouble, we'll make a break for it.你和你的朋友们必须要警惕。一有麻烦，我们就逃。He asked me to keep an eye out for any houses to rent.他让我留意要出租的房屋。The police have been instructed to keep an eye out for pickpockets at the fair.遵照指示，警察在展览会期间警戒小偷。