在过去的十五年里我换过几次工作，买过很多东西，结交了几个朋友。
I've had a few jobs, I've bought a lot of things, and I've made a few friends over these last 15 years.
在过去的十五年里雾气中的小颗粒、烟尘和汽车尾气是不是也对所诊断出的翻倍增长的糖尿病有所影响呢？
Could small particles from haze, smoke and car exhaust have a hand in doubling the number of diagnosed cases of the disease over the last 15 years?
在过去的十五年里，高收入国家的研究人员承认率已经有所改善，但是低收入国家的境况却没有太大的变化。
Researchers acknowledge rates have improved in many rich countries but warn this masks no change in poorer areas over the past 15 years.
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