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The gum collar dips downwards on the inner and outer surface of each tooth but rises between the teeth.
口香糖衣领倾角向下就内,外表面的每一个齿,但上升之间的牙齿。
youdao
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The gum collar dips downwards on the inner and outer surface of each tooth but rises between the teeth.
口香糖衣领倾角向下就内,外表面的每一个齿,但上升之间的牙齿。
youdao