他是一个三岁的男孩。 she is 3 years old. 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.
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In the last few years 在最后几年里in the past few years 在过去的几年里 in the past few years 用于现在完成时态.例:in the past few years they have been dealing with quite a few international corporations. 年老， 例如 in 20 years' time, 其中的 years' 是 名词复数 的所有格形式，该短语的意思是“20年以后”，用于将来时态，也可以说成 in 20 years, 此时 years 没有所有格，后面也不用 time.
