在过去几十年中，来源于诸如家庭供暖和烹饪等的室内污染持续存在，尽管在这方面已经有所改进。
Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.
医疗成本在过去几十年中以惊人的速度增长。
Healthcare costs have been rising at alarming rates for decades.
在过去几十年中，印第安人血统显然颇受青睐。
Over the last few decades, having Native American ancestry has apparently become popular.
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