It peaks in young adulthood, levels out for a period of time, and then generally starts to slowly decline as we age.
它在青年时期达到顶峰，在一段时间内趋于平稳，然后普遍会开始随着年龄的增长而缓慢下降。
However, the market is growing very slowly, and it is expected to decline this year along with the world-wide economy.
不过，这个市场成长非常缓慢，而且由于全球范围的经济危机，这个市场甚至将开始下跌。
Perhaps this will work. It is more likely, however, that newspapers’ fortunes will begin to decline—more slowly than in other countries, perhaps, but bad news just the same.
也许这样会有效，但是更大的可能性是报纸业的收入会慢慢减少，也许没其他国家速度那么快，但坏消息终归是坏消息。
It has now started to decline slowly, andis likely to continue to fall at a slow rate.
其现在已经开始下降，并且有可能继续慢速下降。
SHEKHAR SAXENA: "Dementia is often not recognized. It is commonly mistaken for an age-related decline in functioning because it can mimic age-related problems, and also it progresses slowly."
萨克斯纳：“老年痴呆症常常未被诊断出来，它通常被误认为是一种和年龄有关的身体机能下降，因为它与年龄相关问题类似。”
SHEKHAR SAXENA: "Dementia is often not recognized. It is commonly mistaken for an age-related decline in functioning because it can mimic age-related problems, and also it progresses slowly."
萨克斯纳：“老年痴呆症常常未被诊断出来，它通常被误认为是一种和年龄有关的身体机能下降，因为它与年龄相关问题类似。”
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