Libraries are an investment for the future and they should not be allowed to fall into decline.

图书馆是对未来的一种投资，不应该让图书馆衰落。

《柯林斯英汉双解大词典》

The fact is, our economy did not fall into decline overnight.

事实是，冰冻三尺，并非一日之寒，我们的经济衰退也是如此。

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The fact is, our economy did not fall into decline overnight, nor did all of our problems begin when the housing market collapsed or the stock market sank.

事实是，我国经济陷入衰退并非一朝一夕之力。我们面临的所有问题也并非一概始于房市崩溃或股市滑坡。

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But in a recent report, security firm McAfee suggested that Anonymous could fall into decline this year.

BBC: Hacking group Anonymous latest victim of Twitter hack

The fact is, our economy did not fall into decline overnight.

NPR: Obama's Address To Congress

Negotiations on the key issues of the future of Jerusalem and Palestinian statehood are due to resume next week, and the United States is concerned that unless they can achieve new momentum, there is a danger that the process will fall into decline.

BBC: By the BBC's Richard Lister in Oslo