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並前往https://www.researchgate.net/figure/Relationship-of-elephant-tusk-circumference-with-outer-Schreger-angle_fig2_6896011

Relationship of elephant tusk circumference with outer ...

The Schreger angle technique has been used by in USA and by CITES to distinguish tusks of African ivory and mammoth to prevent illegal trade. Schreger angle ...

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