单词	red flag
释义	red flagˌred ˈflag noun [countable] Examples EXAMPLES FROM THE CORPUS All we needed was a red flag to warn the locals that we might be about to frighten the horses. It was a red flag, a symbol of an anti-education attitude. Volcanologists now recognize these oscillations as a red flag that a volcano is entering a dangerous phase. American English something that shows or warns you that something might be wrong, illegal etc
随便看	observance observant observation observational observation post observation tower observatory observe observer Observer, The obsess obsession obsessional obsessive obsessive-compulsive obsessively obsidian obsolescence obsolescent obsolete obstacle obstacle course obstacle race obstetric obstetrician

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