slavery was regarded as a

slavery was regarded as a 基本解释

奴隶制被视为

重点词汇

slavery n. 奴隶的身分, 奴隶状态, 奴隶制度 [法] 奴隶制度, 奴役, 苦役

regarded v. 关系( regard的过去式和过去分词 )；注意；（尤指以某种方式）注视；尊敬