except when absolutely necessary
Only when absolutely necessary 仅仅在绝对必要的时候 Except When Absolutely Necessary 除非必须 Unless Absolutely Necessary 除非绝对必要 ..
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except when absolutely necessary
除非绝对必要
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Writing Secure Code notes that logging on to your computer as a member of the administrators group--with privileges to do anything to the computer, some of it downright nasty--is a bad idea, except when absolutely necessary.
FORBES: Can You Trust Your Computer?