ring off ； :挂断，悬挂
hang up=ring off
例句
I'；d better ring off now.我该挂电话了
She had rung off before he could press her for an answer.
他还没来得及催她回答，她就挂断了电话
I have to ring off now. I have a train to catch.现在得挂断电话了，我要去赶火车。
hang up: 挂上； 挂住； 使等候； 将电话筒挂上
例句:
The peace talks were hung up.和谈中断了。
She hung up on me. 她不等我说完便挂了电话
