鹅口疮是青蛙的退化，继发于中央和侧沟的继发细菌感染。

Thrush is a degeneration of the frog with a secondary bacterial infection that begins in the central and collateral sulci.

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随着我们年老，我们分泌更少能冲洗掉细菌的唾液，因此牙齿和牙龈更容易退化。

As we age, we produce less saliva, which washes away bacteria, so teeth and gums are more vulnerable to decay.

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