包管理器通过添加和删除包中的各个文件来来预防不完整和错误的安装，以及 “卸载” 应用程序。
The package manager precludes partial and faulty installations and "uninstalls" by adding and removing the files in a package atomically.
如果出现这种情况，这可能是感染的症状，也可能是下载了不完整或不正确的安装程序。
If appear this kind of circumstance, this may be the symptom of infection, also may be to download not complete or incorrect installation program.
如果出现这种情况，这可能是感染的症状，也可能是下载了不完整或不正确的安装程序。
If appear this kind of circumstance, this may be the symptom of infection, also may be to download not complete or incorrect installation program.
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