There are four stages in the process of human civilization progress, which are the tool age, the agriculture age, the industry age and the knowledge age.

人类文明进程可以分为四个时代：工具时代、农业时代、工业时代和知识时代。

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The objects had to cover the whole world, from a cooking pot to a golden galleon, from a tool in the Stone Age to a credit card.

这些物品必须覆盖整个世界，从一个烹饪锅到一艘金色的帆船，从石器时代的工具到一张信用卡。

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In this age of information, we should be experienced in using the Internet as a search tool.

在这个信息时代，我们应该熟练使用互联网这个搜索工具。

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Officials say it will become a major tool in the campaign to end a disease that mainly affects children under age five.

VOA: special.2010.01.18

Would she have imagined that the world famous whatever remembered how many strings were on the lyre on the bench beside the girl on the label of the cigar box he'd stated at in the tool shed at age ten while she, age eleven.

她能想象到这个世界闻名的诸如此类的人,竟然记得当她11岁，他10岁时在工具间里盯着看的,那雪茄盒上的标签上的姑娘身边,长椅上的竖琴有几根弦吗。

耶鲁公开课 - 1945年后的美国小说课程节选

Yammer has built its reputation and business on being a communications tool for the connected age, a quite different approach to the ESN.

FORBES: Microsoft's Apple Killer Strategy - Options

The inspiration for QUE was an age-old but perfect business tool: a simple sheet of paper.

ENGADGET: Plastic Logic debuts QUE proReader, shows off truVue publications

They have thirty or forty years before they need the money but they are using reactive short-term strategies rather than implementing proactive long-term strategies, yet 71% of employees under the age of 30 that have used our online financial assessment tool report having a general knowledge of stocks, bonds, and mutual funds.

FORBES: The 401(k) Is Not Working For Gen Y, But It Can