这项服务能免费让用户通过互联网在苹果设备之间同步文档，照片和应用程序。

The free service lets users synchronize documents, photos and applications between Apple devices over the Internet.

youdao

多人可以编辑同一个文档，同步各自的保存(为云喝彩)。

Multiple people can edit the same document and have their changes synced with each save (hooray for the cloud).

youdao

此外，这两个文档还必须保持同步。

In addition, the two documents must be kept in sync.

youdao