Noun explanation of warning signs

Navigation mark refers to the detailed explanation of navigation mark, that is, navigation mark. Signs, such as lighthouses and buoys, are set in rivers and oceans to warn ships of distress. The police should pay attention to possible dangers, be vigilant and warn: guards. Warning. Warning. Be alert. Guard. Stay alert. Police province (…) (wake up the alarm). Events or messages that need to be guarded against: alarms. Be alert. Alarm bell. Sensitive originality: epigram. Alert(？ )。 Be alert. The national maintenance sign explains the end of the tree, which means superficial, non-essential: specimen. Treat the symptoms, not the root cause. Mark: trademark. Road signs. Mark. Sign. Ruler's slogan To express in words or other things: express. Title. Price tag. Advertise (originally for revealing and displaying; Later extended to propaganda and boasting).