Home/bluejackbluejack/bloo-jak/US // ˈbluˌdʒæk //蓝杰克,蓝夹克,蓝鲸,蓝天白云Definitionsn.名词 noun1: a small oak, Quercus incana, of the southern U.S., having crooked branches and blue-green leaves.Level 5Browse all words →