backed up_单词backed up_backed up的解释和用法

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backed up

backed up基本解释

毒品麻醉的

backed up英英释义

动词 back up:

give moral or psychological support, aid, or courage to
move backwards from a certain position
establish as valid or genuine
make a copy of (a computer file) especially for storage in another place as a security copy
become or cause to become obstructed

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