这项发明已经被他们证明有很大的商业价值 this invention has been pro

英语翻译1、这项发明花费了他很多时间和金钱（cost）2、他的错误与他的粗心大意有很大关系（have...to do w 英语作文 我的发明 An invention 这个问题已经在昨天的会议中提出了.This problem has been come up with at the m 发明invention可数吗? 英语翻译这个表单已经交付给客户并签收.This form has been submitted and signed b 盘尼西林这项发明有什么重大意义? this has not been easy.中has not been什么意思?怎么来的?具体点 This IP has been banned This accout has been temporarily this file has been damage This URLs or Page has been blocked.的解决方法!急 I know this has been hard.has been 是什么语法?