The decline in American Indian languages has historical roots.
美国印第安语言的衰落有其历史根源。
This is the decline in the growth in yields of some of the world's major crops.
这是世界上一些主要农作物产量增长速度的下降。
Researchers have found that the decline in waters near the poles is most pronounced.
研究人员发现，在两极附近的水域跌幅最为显著。
Can anyone be sure if the decline is really caused by the hunting or by climate change?
有人能确定这种下降到底是由捕猎还是气候变化引起的吗?
Blaming the permissive 1960s is nothing new, but this is not yet another criticism against the decline in education.
指责教育宽松的20世纪60年代并不是什么新鲜事，但这次并不又是针对教育衰落的批评。
"Many factors contributed to the decline", said Patrick McIntyre, an ecologist who was the lead author of the study.
该研究的领头作者、生态学家帕特里克·麦克伦泰尔表示：“许多因素导致了这种下降。”
Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely.
对于鲸鱼数量的下降，有两种可能的解释——虎鲸捕食或疾病的增加——疾病的可能性更大。
The aim is to reverse the decline in the number of tree species or at least to preserve the "genetic material" of all of them.
其目的是扭转树种数量下降的趋势，或至少保存所有树种的“遗传物质”。
The decline started in the 1950s, when manufacturing generated a sturdy 28% of the national income, or gross domestic product, and employed one-third of the workforce.
衰退始于20世纪50年代，当时制造业创造了28%的国民收入（国内生产总值），并且雇佣了三分之一的劳动力。
Primary care physicians who refuse to compromise quality are either driven out of business or to cash-only practices, further contributing to the decline of primary care.
拒绝在质量上妥协的初级保健医生要么被赶出这个行业，要么只能接受现金，这进一步加剧了初级保健的衰落。
Some simplistically attribute the decline in our public education system to the drain of skilled students by private schools, but far more significant events were at work.
一些人将公共教育体系的衰退简单粗暴地归因于私立学校技能型学生的流失，但更重要的因素仍在发挥其影响。
The more important goal is using interactive learning to discover the cause of the decline and compare it to issues we face today—natural disasters, environmental problems, and war.
更重要的目标是利用互动式学习来发现减少的原因，并将其与我们今天面临的问题——自然灾害、环境问题和战争——进行比较。
These days, as studies in the U.S.show bullying on the rise and parental supervision on the decline, researchers who study bullying say that calling moms and dads is more futile than ever.
如今，随着美国的研究显示欺凌行为在上升，而父母的监督在下降，研究欺凌行为的研究人员说，给父母打电话比以往任何时候都更没用。
Thankfully the smoking of cigarettes is on the decline.
感谢的是吸烟正在减少。
Government penny-pinching is blamed for the decline in food standards.
政府吝啬被指责是食品标准下降的原因。
The decline is not because we have all become lazy.
这种下降并不是因为我们都变得懒惰了。
Things have been on the decline for some years.
几年来，这种情况发生的几率一直在下降。
What is causing the decline of the world's giant forests?
是什么导致了世界上巨型森林的减少？
The decline in interest in literary fiction is also one of the causes identified by Leslie.
对文学小说兴趣的下降，也是莱斯利发现的原因之一。
Analysts attribute the decline to such factors as advances in digital databases and communication systems.
分析师将这种下降归因于数字数据库和通信系统的进步等因素。
The decline of play is a special hazard for the roughly 1 in 5 children in the United States who live in poverty.
对于美国约五分之一的贫困儿童来说，玩耍的减少是很严重的危害。
Cambridge scientist Peter Wadhams, who's been measuring and monitoring the Arctic since 1971, says the decline is irreversible.
剑桥科学家彼得·沃德姆斯自1971年以来一直在测量和监测北极，他说这种减少是不可逆转的。
The decline in moral standards—which has long concerned social analysts—has at last captured the attention of average Americans.
道德标准的下降长期以来一直令社会分析人士担忧，现在终于引起了普通美国人的注意。
Unfortunately, activities involving direct contact with people, which contributed to better wellbeing, were found to be on the decline.
不幸的是，人们发现，有助于提高幸福感的与人直接接触的活动减少了。
Tobacco taxes, which generate more than twice as much, have proven instrumental in the decline of smoking, which has saved millions of lives.
烟草税的收入是其两倍多，事实证明，它在减少吸烟方面发挥了重要作用，挽救了数百万人的生命。
The decline in government support has made fundraising an increasing necessary ability among administrators and hiring committees hungry for Americans.
政府资助的减少使得筹集资金成为行政人员的必备能力，也使得招聘委员会急需美国人。
While the decline over the past decade is steep for teen readers, some data in the report shows that reading remains a big part of many children's lives.
尽管在过去的十年里，青少年读者的阅读量急剧下降，但报告中的一些数据显示，阅读仍然是许多孩子生活的重要组成部分。
The decline of our fish stocks may have changed the landscape forever, but the kipper, a cold-smoked herring, still remains one of the great tastes of England.
虽然近年来我们的鱼类储量下降，可能永远无法再现曾经的风光，但冷烟熏制的熏鲱鱼仍是英格兰最美味的食物之一。
The decline of Europe's forests over the last decade and a half has led to an increasing awareness and understanding of the serious imbalances which threaten them.
在过去的15年里，欧洲森林的退化使人们越来越意识并了解到这些会对他们构成威胁的严重失衡状态。
The decline of Europe's forests over the last decade and a half has led to an increasing awareness and understanding of the serious imbalances which threaten them.
在过去的15年里，欧洲森林的退化使人们越来越意识并了解到这些会对他们构成威胁的严重失衡状态。
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