符合的藏品

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哺乳動物牙齒的基本構造

, known as the milk teeth, fall out after several months or years. The second set is the permanent.....more

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Channel, so they flourished in this area for some time. Though they have now died out, the rich variety.....more

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are gradually worn away at an angle and, as they gradually grow and move forward, squeeze out and replace.....more

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