CNN News:世卫组织发布最新报告 全球每年700万人死于空气污染

重点讲解：
1. according to 据…所说；按…所载；
You've been absent six times according to our records.
根据我们的记录，你已经缺席六次了。
2. keep track of 跟上…的进展；掌握…的最新消息；
Now that you know your fitness level, keep track of your progress.
现在你已经知道了你的健康水平，保持跟踪你的健身进度。
3. die from 死于；
This is because millions of children die from diseases that can be prevented through vaccines.
因为，数百万儿童死于可以通过疫苗预防的疾病。
4. lead to 招致；致使；导致；
The improper use of medicine could lead to severe adverse reactions.
用药不当会产生严重的不良反应。