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單字 backup
音標與例句
    音標 [ ˈbækʌp ]
    Turn the union and the locknut at the same time until the backup washer comes into contact with the equipment.
    同時轉動管節與鎖定螺帽，直到備用墊圈接觸到裝備。
字義 n.[C][U]備用; adj.備用的
圖說 backup
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