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A hard disk is not required but can be used to host the operating system.
磁盘并非必要，但可以用来托管操作系统。
youdao
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The security of operating systems from abroad is hard to trust.
从国外引进的操作系统，其安全性难以令人放心。
youdao
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The security of operating systems from abroad is hard to trust.
从国外引进的操作系统，其安全性难以令人放心。
youdao