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His teeth having all dropped out, he could only nibble away at his food.
他牙齿全掉光了, 他吃东西时只能一点一点地咬.
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Her teeth having all dropped out, Granny Li could only nibble away at her food.
李奶奶的牙齿全部落光了, 她吃东西只能一点一点地啃.
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