... refer to参考，查阅；涉及，提到；指的是 ring off挂断电话 run down撞倒；说…坏话，贬低；停止运转，耗尽；减少，缩减；查找出，搜索到 ...
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ring-off indicator 空线指示器
ring-off signal 话终信号
ring off the hook 电话响个不停
ring off drop 终话指示吊牌 ; 话终吊牌
ring-off button 拆线按钮
PHRASAL VERB When you ring off, you put down the receiver at the end of a telephone call. 挂断电话 [英国英语]
Don't ring off!
不要挂断电话！
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