Nǎinai dé le tuìxíngxìng guānjiéyán, zǒulù shí xīgài hěn téng.
Grandma has degenerative arthritis, and her knees hurt when she walks.
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usage
A medical word for conditions in which tissue wears down over time, especially with age: 退行性关节炎 "degenerative arthritis", 神经退行性疾病 "neurodegenerative disease" such as Alzheimer's. In psychology 退行 is "regression".
