凭音响判断是假钱

ring fence───围栅

ring flash───环形闪光灯

ring gage───环规

ring gauge───环规

ringhals───n.粗皮小眼镜蛇（产于南非）

ringhalses───n.粗皮小眼镜蛇（产于南非）

ring flashes───环形闪光灯

It took Porter four false starts before he found the courage to ring the first doorbell.───波特一开始四次都没敢敲门，第五次才鼓起勇气按了第一户人家的门铃。

Pictured above in the inset, part of the dust ring appears as false-color orange in front of numerous background stars.───上图的插图中，在大量的背景恒星前，部分的尘埃环套以橘色显示。

Her laughter has a false ring.───她的笑声中有种虚伪的味道。