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.
在过去几十年中，科学不断进步。
In the past few decades, technological advances have come thick and fast.
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，要加快这一演变的步伐。
In the past several decades, the pace of this evolution has quickened.
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.
多么可惜，这一切的世界洞已在过去几十年中破坏的规模。
What a pity that the scale of this all-world hole has been compromised over the past several decades.
在过去几十年中，社会对森林的期望已经发生了根本性转变。
Over the past few decades the societal expectations from forests have changed fundamentally.
伦敦证券交易所主板上的企业数量在过去几十年中已下降一半。
The number of companies on London's main market has fallen by half over the past decade.
研究人员发现适宜于钉螺和血吸虫生长的时期在过去几十年中有不同程度的延长。
The researchers found that an increase in the length of time environmental conditions were ideal for the growth of both the Oncomelania snail and the Schistosome worm.
做为一个群体，生于80年代的人所具备的乐观精神在过去几十年中也是没有的。
As a group, the generation is also infused with an optimism not seen among kids in decades.
不幸的是，在过去几十年中，我们在我们的国家里目睹了一系列严重侵蚀婚姻文化的过程。
Unfortunately, we have witnessed over the course of the past several decades a serious erosion of the marriage culture in our own country.
不过也还有一些别的原因，总之，它们都使得这些大公司找回了在过去几十年中遗失的自信。
But there are other reasons too, which are giving big companies a self-confidence they have not displayed for decades.
在过去几十年中，地震学家发现在卡罗来纳到密苏里河之间的任何地方都是潜在的严重断层地带。
In the past few decades, seismologists have discovered potentially serious fault lines everywhere from the Carolinas to Missouri.
在过去几十年中，认知语言学家对于隐喻对英语和中文中情感概念化的作用进行了大量的研究。
During the past decades, cognitive linguists have conducted a great number of researches, which studies on the function of metaphor in the conceptualization of emotions in English and in Chinese.
在过去几十年中，天文学家们已经了解到类星体周围存在的大风，也就是超重黑洞周围形成的热气。
For decades, astronomers have known about the presence of winds around quasars, the discs of hot gas that develop around supermassive black holes.
在过去几十年中，石榴树节点可以大量水果在每个季度，父亲会被告知李惠珍和她的兄弟胡同的邻国发出。
The past few decades, the pomegranate tree node can be a lot of fruit in each quarter, the father will be told Hui-Zhen Li and her brothers to the alley's neighbors sent.
日本在全球产出的比例在过去几十年中一直在减少，但是仍占到了9%。这还是会令日本的表现对全球产出产生非常显著影响的。
Japan's share of world output has been shrinking for decades, but at 9% it remains large enough for the hit to the country's growth to subtract noticeably from global output.
在过去的几十年中，对语言的本质以及产生并使其易于理解的过程的研究表明，它具有极大的复杂性，而不是潜在的简单性。
Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.
在过去的几十年中，硬盘驱动器的容量或尺寸已经飞速发展。
Over the past decades, the capacity, or "size," of hard drives have exploded.
在过去的几十年中，获得利润是要承受很大压力的。
Profits should have been under extreme pressure for the past few decades.
与加州的很多地方一样，在过去的几十年中，大南方岬遭受了干旱和升温的双重打击。
Like much of California, Big Sur has been hard hit over the past few decades by drought and rising temperatures.
在过去的几十年中，适当营养的生物需求证据、建议的喂养方式和阻碍适宜喂养的因素都有稳步增长。
Over the past decades, the evidence on the biological requirements for appropriate nutrition, recommended feeding practices and factors impeding appropriate feeding has grown steadily.
在过去的几十年中，我们埋头研究人类工作效率的驱动因素。
For the past few decades we have buried ourselves in research into the drivers of human performance.
在过去的几十年中，我们埋头研究人类工作效率的驱动因素。
For the past few decades we have buried ourselves in research into the drivers of human performance.
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