Ylds = years lived with disability ylds衡量疾病负担。通过将疾病的患病率乘以与该残疾相关的短期或长期健康损失（残疾权重）来计算yld。 dalys = ylls + ylds = disability adjusted life years. The alternation of dynasties is the historical process of idealists moving up and down. 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业.
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Eg:hangzhou has witnessed the changes of history for more than 2000 years.
英语 learn 和 study 是同义，意思是 acquire knowledge 可以互相替用，不用那么钻牛角尖执着, 虽然 study 比.
When those in power forget their original intentions, those below can take their place.
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