this has not been easy.中has not been什么意思?怎么来的?具体点

this has not been easy.中has not been什么意思?怎么来的?具体点 This has not been easy 和 this is not easy 不是一个意思吗 audio in this system has not been enabled什么意思 this has not been easy与this is not easy区别 新概念二册 的52课：This has not been easy she has not been around this week 我想请问你一下新概念二52课中 This has not been easy because i own over a This has not been easy because i own over a thousand books.这 This has not been easy because I own over a thousand books. 英语翻译this has not been easy because i own over a thousand boo Not been before, has been lost.是什么意思 has been in 的意思,具体,例子,