key-tooth failure 键齿失效
automatic key tooth coding 钥匙牙花自动编码
·2,447,543篇论文数据，部分数据来源于NoteExpress
The training to open their mouths was key to staff spotting a rotting upper left canine bothering Arktos last year and a damaged tooth that troubled Walker in 2011.
BBC: How do you give a polar bear a 'medical'?
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