对于年趋严重的HIV感染疫情，必须迅速采取有效的预防措施来降低流行率。

The effective measures must be taken to reduce the HIV prevalence as soon as possible for the HIV infections in Yunnan are becoming more and more serious year by year.

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太阳活动的周期是11年。新数据表明，在一个周期末期太阳活动趋弱时，抵达地球的光与热的量增加而不是减少了。

As solar activity waned at the end of one of the Sun's 11-year cycles, the new data shows the amount of light and heat reaching the Earth rose rather than fell.

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总之，37%的年轻家庭在2009年的净收入趋零，甚至为负数，这一数据比1984年同比增长了19%。

Overall, 37% of the young households held zero or negative net worth in 2009, up from 19% in 1984.

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