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backed up的英文翻譯是什么意思，詞典釋義與在線(xiàn)翻譯：
英英釋義
動(dòng)詞 back up:
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give moral or psychological support, aid, or courage to
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move backwards from a certain position
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establish as valid or genuine
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make a copy of (a computer file) especially for storage in another place as a security copy
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become or cause to become obstructed
