Yu Lei Books

Xian dai hai zhan bing qi
Xian dai hai zhan bing qi

By Yu Lei, Guixi Qu

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Gong Zizhen zhuan
Gong Zizhen zhuan

By Yu Lei

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Clearer Skies over China
Clearer Skies over China

By Yu Zhao, Yu Lei, Mun S. Ho, Yuxuan Wang, Chris P. Nielsen

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China's carbon dioxide emissions now outstrip those of other countries and its domestic air quality is severely degraded, especially in urban areas. Its sheer size and its growing, fossil-fuel-powe...

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Xi dian ming jiang
Xi dian ming jiang

By Yu Lei

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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