Scribd is a social publishing site, where tens of millions of people share original writings and documents. Scribd

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontlin...

meta描述,meta描述

Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with fr...

Altair Engineering, Inc. empowers client innovation and decision-making through technology that optimizes the analysis, management and visualization o...

BD Biosciences is a world leader in bringing innovative diagnostic and research tools to life scientists, clinical researchers, laboratory professiona...

软件开发程序员博客文章收藏网提供软件开发，开发技术，程序员博客，博客技术文章的收藏、分享和推荐。

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections t...

Twitter is without a doubt the best way to share and discover what is happening right now.

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