Paper-cuts of animals have been found in tombs which date back over 1,500 years.

人们已经在1500多年前的墓穴中发现了动物剪纸。

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Some of the signs date back over 100 years.

对一些迹象可以追溯到100年以上。

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Many of the ancient ruins date back over 4000 years, with some caves showing signs of life over 10,000 years ago.

许多古代遗迹可以追溯到超过4000年，一些洞穴呈现生命的迹象在一万年前。

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The events of the case date back to 2003 and the furor over the invasion of Iraq.

NPR: Libby Sentenced to 2 1/2 Years in CIA Leak Case

The generic is Budeprion XL 300, and concerns over its effectiveness date back to 2007 when patients started complaining of multiple side effects, including headaches, anxiety and insomnia.

FORBES: FDA Pulls Generic Antidepressant for Ineffectiveness

Pushing back the date of retirement is certainly something over which older workers have some control.

FORBES: Singing for Your Supper in Retirement