Even then, you cannot upgrade to a lesser version-say, from Vista Ultimate to a Windows 7 Home Premium.
即便如此，你不能升级至较低版本——即是说，不能从Vista旗舰版升级至Windows7家庭高级版。
Even then, you cannot upgrade to a lesser version-say, from Vista Ultimate to a Windows 7 Home Premium.
即便如此，你不能升级至较低版本——即是说，不能从Vista旗舰版升级至Windows7家庭高级版。
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