Can only delete mail folders.

只能删除邮件夹。

youdao

The itemized changes are used to only encrypt (or delete) files that have changed since the last synchronization.

通过使用修改记录，只加密（或删除）在上一次同步操作之后修改过的文件。

youdao

Only a hard delete activates the overwrite.

只有硬删除才会引起覆盖。

youdao

You can only delete photos in the Photos app on an iPad if they were either taken on the iPad, received on the iPad via email and saved to the Camera Roll, or loaded using the iPad USB or SD card camera adapters.

WSJ: Clearing Up an iPad Picture Problem

Our brains can only process so much information, so delete what you are not using - like the 500 watch-lists and articles you thought you might get to next week.

FORBES: Ten Tips To Clear Your Portfolio's Dead Weight

If you want to limit exposure to any content, either delete it completely or narrow the audience to only those you really want to share it with.

FORBES: First Impressions of Facebook's New Graph Search. It's Your Personal "Big Data"