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1·There are some characteristics about it, for example, highly tracking accuracy and tracking function etc. These characteristics need the require which can accurately measure tooth trace error.

此技术具有跟踪精度高，跟踪性能好等特点，满足了高精度测量齿向误差的要求。

2·She used a slither of tooth enamel the size of a nail clipping to trace his origins.

埃文斯通过大小相当于小钉的牙齿瓷釉（珐琅）质，来确定他的来历。

3·Conclusion in tooth shape keys, the tooth slope angel increases, along with slope Angle of duplicated trace decrease.

结论凸齿钥匙上仿形刀增配痕迹倾斜角度随齿坡角的增大而减小。