back up和back out的区别
问题描述:
back up和back out的区别
他们是都有“倒退” 如果是,那么又有什么不同?
答
back out=放弃
back up=备份,支持他们是都有“倒退” 的意思吗?如果是,那么又有什么不同?谢谢。back up 没有“倒退” 的意思
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