英语词汇back-up system是什么意思，back-up system的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-觉斋网

单词	back-up system
释义	back-up system　【计】后援系统; 后备系统
随便看	approval offer approval procedure approval sales approval sales returns approval test approvals approvals approvals approve approve approve approve approve a bill approve a bill approve estimates approve of approve of approve of approve oneself approved approved approved approved approved acceptance approved accountant

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