The self link is especially useful; if you ever end up with an Atom document that you didn't download yourself, this is your trail of breadcrumbs back to the canonical source.

self链接特别有用；如果有一个不是自己下载的Atom文档，那么通过该链接就可以回溯到规范来源。

youdao

(You can also embed the three final lines of the script in a loop, dynamically change SOURCE, and back up a series of separate directories on the same system.) Here's how the backup works.

(还可以把脚本的最后三行嵌入一个循环，动态地修改SOURCE，从而备份同一系统上的一系列目录)。

youdao

You should back up any data source before implementation is started.

在开始运行之前，您应该先将所有的数据源备份。

youdao

With a 1200mAh battery power bank, users can charge their phones via USB while they stream or use the speaker as a back-up power source on the go.

ENGADGET: Braven's budget-friendly Bluetooth speaker to debut on QVC for $100

Back then many companies ran a free, open-source e-mail relay technology but ended up spending more than they thought they would making the stuff work.

FORBES: You Get What You Pay For

You can record from any stereo source with a stereo in-line jack and won't have to get any specialized software to put recordings back on your computer--all you need is an analog or digital source at bit rates up to 160 kbps.

FORBES: Magazine Article