cindexchalkrail./chawk-reyl/US // ˈtʃɔkˌreɪl //白垩纪,粉笔画,白垩纪的发展,白垩纪的发展历程Definitionsn.noun · 名词1.›a troughlike molding or strip holding chalk, erasers, etc., under a blackboard.Level 5More words in c →