Business telephone - nitsuko telephone 电话系统- nitsuko电话
Business telephone - nortel telephone 商业电话- nortel电话
Business telephone - iwatsu telephone 商业电话- mitel电话
Business telephone - mitel telephone 商业电话- mitel电话
Business telephone - nec telephone 商业电话- nec电话
Business telephone overview - -商业电话总览-
Business telephone overview -商业电话总览-
Index for business telephone 商业电话目录
Business telephone network 保安电话网
To put someone on hold ( used in business telephoning ) : to ask a phone caller to wait ( usually music is played while s / he is waiting ) 本单元的语言点是冠词，英语中有三个冠词，下面是关于冠词的用法。
