求翻译：360安全卫士是当前功能最强、效果最好、最受用户欢迎的上网必备安全软件。不但永久免费，还独家提供多款著名杀毒软件的免费版。由于使用方便，用户口碑好，目前3亿中国网民中，首选安装360的已超过2.5亿。是什么意思？

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