slave trade had long been发音

意思翻译

奴隶贸易长期以来

相似词语短语

slave trade───奴隶贩卖；n.贩卖奴隶

had been───已经（过去完成时）

had been done───过去完成时的被动语态

had been sold───已经被卖掉了

had never been───从来没有……（been是be的过去分词）

had been on───一直在

had a long───有很长一段时间

slave───n.奴隶；从动装置；vi.苦干；拼命工作；n.(Slave)人名；(塞、罗)斯拉韦

been───v.是，有（be的过去分词）；n.(Been)（美）贝恩（人名）

双语使用场景

英语使用场景