短語詞組短語regeneration under crown cover 林冠下更新tunnel under shallow cover 淺埋隧道under separate cover 另封;另郵;另函郵寄under plain cover 以普通信封寄發(fā);用沒有注明商號;繙譯;沒有注明寄發(fā)人姓名under insurance cover 根據(jù)保險;根據(jù)保險涵蓋under the cover 遮蓋著under superficial cover 冠冕堂皇under r cover to 附在信中send under plain cover 用不注明發(fā)信人姓名的封皮寄發(fā)undercover agent 臥底；警方密探 返回 under cover