那个愤怒的司机是个爱咬牙切齿的人，你能听到他牙齿摩擦的声音。

The angry driver was such a ___gnasher that you could hear his teeth grinding from the next seat.

那个老人咧嘴一笑，露出了他那副闪亮的假牙。

The old man grinned, showing off his shiny new ___gnashers.