but efficacy declined
但疗效下降了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Tenofovir, he added, lowered the risk of infection by 50% at 12 months but then the efficacy declined.
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But there were hints of efficacy: a 20% reduction in how fast patients declined on a different version of the ADAS-cog, and a 19% reduction on the Activities of Daily Living Inventory.
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