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	sheer line sheer plan sheer pole sheer ratline sheer strake Sheer Thursday sheer-off sheered sheerer sheerest sheering sheerlegs sheerly sheerness sheernesses sheers sheesh sheet sheet anchor sheet bend sheet cable sheet cake sheet cakes sheet chain sheet composting

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