短语词组短语Call Forwarding On 呼叫转接打开;开启来电转接Call Forward on Busy 具有遇忙转接call provision on bond 债券可随时偿还的规定call down on 祈求call time on 终止Call recording on demand 按需录音Call back on busy 回拨繁忙;遇忙回叫 返回 call on