The last decade has witnessed a serious rise in the levels of racism and hostility to black and ethnic groups.
过去的10年里，种族主义及对黑人和少数民族的敌意变得更加严重了。
The last decade, however, has witnessed a (slowly building) revolution in health care, as more and more hospitals become convinced of the therapeutic power of humor.
然而，在过去的十年间，健康保健系统已经开始有了一些缓慢的改进，越来越多的医院已经开始认识到幽默疗法的强大作用。
The last decade, however, has witnessed a (slowly building) revolution in health care, as more and more hospitals become convinced of the therapeutic power of humor.
然而，在过去的十年间，健康保健系统已经开始有了一些缓慢的改进，越来越多的医院已经开始认识到幽默疗法的强大作用。
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