在数据库文档中,be kept up to date是啥意思啊

在数据库文档中,be kept up to date是啥意思啊 be up to date的意思? 为什么是must be kept而不是must to be kept up-to-date informention什么意思 CodeBlocks中“Target is up to date.Nothing to be done.”是什么意思? turboc2中is up to date It should be brought up-to-date翻译 up-to-date up to date是什么意思 it must be terrible to be grown up中to be 是个什么成分啊? be kept to do access to up-to-date