单词	air observation
释义	air observation noun : observation from an aircraft specifically : such observation of artillery fire Word History First Known Use 1916, in the meaning defined above
随便看	tuning in tuning out tuning peg tuning pipe tuning ring tuning slide tuning wrench tunings Tunis Tunis grass tunises Tunisia tunisiae tunisian tunisians tunisias tunisses tunk Tunker tunkeres tunkers tunket tunnage tunnages tunned

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