bindexbluejack./bloo-jak/US // ˈbluˌdʒæk //蓝杰克,蓝夹克,蓝鲸,蓝天白云Definitionsn.noun · 名词1.›a small oak, Quercus incana, of the southern U.S., having crooked branches and blue-green leaves.Level 5More words in b →