• Teeth covered by an operculum can be difficult to clean with a toothbrush.

    被盲袋覆盖的牙齿很难用牙刷清理。

    youdao

  • Teeth covered by an operculum can be difficult to clean with a toothbrush.

    被盲袋覆盖的牙齿很难用牙刷清理。

    youdao

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