additions添加剂additionn.增加；加法；附加物addition product附加产品,加成物additional force附加力additional light补充照光additional alarm求援火灾警报additional state附加状态additional space额外的空间additional funds[经] 增加基金, 追加基金, 附加基金addition cascade相加级联additional sound附加(心)音, 额外音additional frame附加帧

1. Adding a file or page might require repeating some of the roll forward.
   添加文件或页可能需要重复某些前滚。
2. This behavior occurs because Windows Setup requires additional files and folders to be present in the installation directory.
   以上是微软的网站对此问题出现做出的解释，意思就是说系统安装需要在目前的安装目录里添加文件和文件夹。