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ThreeVPNproviders-Astrill, StrongVPN and Golden Frog-claimed last week that their services had been disrupted and become unavailable for users on the Chinese mainland...
1. 红海市场是指现有的、竞争激烈的市场环境，其中参与者众多，资源争夺(zheng duo)激烈。2.蓝海(lan hai)市场则指未知(wei zhi)的、尚未被充分开发的领域，这里的机会与竞争较少，企业可以在此...