We are seeing a decline in major ecosystems like kelp forests, sea life communities, coral reefs and so on.

我们正目睹像海藻丛林，海洋生物群落，珊瑚礁等主要生态系统的衰落。

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The scientific evidence from countries like Australia, Canada, and the USA clearly indicates a decline in the birds' numbers.

来自澳大利亚、加拿大和美国等国家的科学证据清楚地表明，这种鸟类的数量下降了。

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This is a huge drop and it is important to note that this was not merely a decline in reading paper books, newspapers or magazines.

这是一个巨大的下降，值得注意的是，这不仅仅是阅读纸质书籍、报纸或杂志的下降。

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"For years,there was a decline in teen pregnancy, I believe between 1991 and about 2005,"

VOA: standard.2009.12.04

And what this is is technically described as a decline in the tendency to respond to stimuli that are familiar due to repeated exposure.

它在学术上被描述为,由于重复暴露在刺激环境中,而造成对该刺激反应倾向的降低。

耶鲁公开课 - 心理学导论课程节选

That explains, in large part, why there was such a decline in population, why the Dark Ages were so dark, lots of poverty, lots of starvation, but also, as I suggested when I spoke of this earlier, also the freedom if you could make it, to learn and also to grow stronger.

这解释了,在绝大部分地区,为什么存在着这一类的人口消减,为什么黑暗时代如此黑暗,如此贫困,如此多的饥荒,但是同时,就如在我之前所提到的,同样可以,如果做得到的话,去学习以及使自身强大

耶鲁公开课 - 古希腊历史简介课程节选

The change in personnel comes as the company is battling a decline in consumer PC sales.

BBC: Amy Hood

Management blamed the moderation on a decline in consumer confidence and the macro environment.

FORBES: Expert Panel: Whole Foods Should Not Drop Its Prices

Forty-one states showed a decline in the traditional household set-up: A married couple with children.

FORBES: Single People: Happy, Healthy, And The Majority