She found that young women in Denmark have a significantly lower natural conception rate than in past decades.
她发现，丹麦的年轻妇女的自然受孕率比过去的数十年要很明显地低。
That is important: the brain drain out of universities has been a huge, if largely hidden, loss in past decades.
这一点是重要的：在过去的几十年中，大学中的人才流失是一个巨大的、而且往往是相当隐性的损失。
Thus Chinese water conservancy resettlement, despite its achievements in past decades, exposes several problems which are to be envisaged under the synergetic effects of current various conflicts.
中国水利工程移民尽管数十年来成就斐然，但在现阶段各种各样矛盾冲突的共同作用下，仍然暴露出了一些必须正视的问题。
The percentage of retirement-age people in the labor force has doubled over the past three decades.
过去三十年来，退休年龄人口在劳动力中的比例翻了一番。
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，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。
In the past two decades, continued connection with and dependence on family have increased significantly.
在过去的二十年里，人们与家庭的联系和对家庭的依赖大大增加了。
In the past two decades, however, continued connection with and dependence on family, thanks to cell phones, email and social media, have increased significantly.
然而，在过去的二十年中，由于手机、电子邮件和社交媒体的出现，人们与家庭的联系和对家庭的依赖显著增加。
We originally had this suspicion back in 2016, puzzled by the fact that national statistics showed calorie consumption falling dramatically over past decades.
我们最初在2016年就有了这种怀疑，让我们感到困惑的事实是，当时国家统计数据显示，卡路里的消耗量在过去几十年里急剧下降。
For the past several decades, it seems there's been a general consensus on how to get ahead in America: Get a college education, find a reliable job, and buy your own home.
在过去的几十年里，人们对如何在美国取得成功似乎已经达成了一个普遍的共识：接受大学教育，找到一份可靠的工作，然后买一栋自己的房子。
What Farrant and others have found over the past two decades is that there are many genes involved in resurrection plants' response to dryness.
在过去二十年中，法兰特和其他人发现，有很多基因参与了复苏植物对干旱的应对。
Although many foods are naturally rich in salicylates, for the past several decades, food-processing companies have also been adding salicylates to foods as preservatives.
尽管许多食品天然富含水杨酸盐，但在过去几十年里，食品加工公司也一直在食品中添加水杨酸盐作为防腐剂。
Frustrated by these restrictions, Subra left her job in 1981, created her own company, and has devoted the past two decades to helping people fight back against giant industrial polluters.
由于对这些限制感到失望，苏布拉于1981年离职，创建了自己的公司，并在过去20年里致力于帮助人们对抗工业污染巨头。
Over the past three decades the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
Over the past three decades, the number of students leaving home each year to study abroad has grown at an annual rate of 3.9 percent, from 800,000 in 1975 to 3.5 million in 2008．
在过去的30年里，每年出国留学的学生人数以每年3.9%的速度增长，从1975年的80万人增长到2008年的350万人。
In the past two decades two new rechargeable-battery types made their commercial debuts.
在过去20年中，两种新型充电电池闪亮登场。
But in the past three decades this subtle musical voice has grown quieter and quieter. Until now.
但在过去的三十年中，这种不可思议的美妙音乐趋于销声匿迹——直到现在。
The Numbers of fish and other ocean life have dropped dramatically in the past few decades.
在过去的几十年里，鱼和其他海洋生物的数量戏剧性地减少。
But the ban proved difficult to enforce; Zimbabwe, Botswana and Namibia have in the past decades accumulated a stockpile of ivory gathered through legal efforts.
但是这项禁令实施起来非常困难。津巴布韦、博茨瓦纳和纳米比亚在过去十年里通过合法途径已经积累了大量的象牙储备。
In the past decades, China has made significant achievements in promoting technological innovation and productivity growth.
过去几十年里，中国在促进技术创新和提高生产率方面取得了巨大成就。
But canine cognition has become a serious science in the past few decades.
但是在过去的几十年里犬的认知已经形成一门严肃的科学。
But in the past three decades this subtle musical voice has grown quieter and quieter.
但在过去的三十年中，这种不可思议的美妙音乐趋于销声匿迹——直到现在。
The shape of finance has changed radically in the past few decades.
在过去的数十年间金融的形态发生了翻天覆地的变化。
Obesity among children is increasing at an even more alarming pace, having more than tripled in the past two decades.
儿童肥胖率更是以惊人的速度在上升，在过去二十年中已经增长了三倍。
In the past two decades, many politicians have followed a narrow and callow career path.
过去二十年里，许多政客走的是一条狭隘无知的职业道路。
In the past few decades, workers have generally lost ground against employers in negotiating terms of employment.
在过去几十年，雇员与雇主协商雇佣条件时通常都已失去了立场。
In the past few decades, workers have generally lost ground against employers in negotiating terms of employment.
在过去几十年，雇员与雇主协商雇佣条件时通常都已失去了立场。
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