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tooth root circle | |||
whole depth circle; whole depth root circle | |||
dedendum circle; root circle | |||
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root circle | |||
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dedendum circle; root circle | |||
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bottom line of teeth |
齿 根 圆 : 20 phrases in 4 subjects |
Automobiles | 7 |
Plastics | 4 |
Technology | 8 |
Wind Energy | 1 |