Moreover, an element that has no content is represented by an empty child list, but a self-closed tag is represented by None. Listing 2 shows this structure in action.

而一个没有内容的元素由一个空的子列表表示，但是一个自封闭的标记由None表示。

youdao

I hope it's something you'd never have to use, but it's certainly worth going along to a few self-defence sessions.

我希望这是你永远都用不上的东西，但是去参加一些自卫课程当然是值得的。

youdao

Franklin, who was largely self-taught, may have been a genius, but he wasn't really an exception when it comes to American making and creativity.

富兰克林在很大程度上是自学成才的，他可能是一个天才，但在谈到美国制造和美国创造时，他并非例外。

youdao

But the city also has the American Visionary Art Museum, a museum that celebrates the work of self-taught individuals.

VOA: special.2011.03.07

If you had a course in probability and statistics, then you'll find it easy to follow, but it's self-contained again.

如果你们学过统计学或者概率论,你们会比较容易理解,也需要你们独立学习

耶鲁公开课 - 金融市场课程节选

Other cells in the immune system recognizing that this is a foreign molecule, but is being presented in the context of a 'self' cell.

免疫系统中的其他一些细胞,识别到它是非己物质,但它已经被识别为己方细胞

耶鲁公开课 - 生物医学工程探索课程节选

But a self-supported ride across country is way harder than what Paul and I did (we went with a company that carried our clothing and provided on-road support).

FORBES: Public Service Message: Americans are Awesome

But a self-guided tour of venues, which you can see from a distance, and of the surrounding neighbourhoods can be taken by downloading a free guide from the non-profit organisation Winning Endeavours.

BBC: Walking London��s Olympic sights

The market for Web stocks is once again bubbling, but a new self-proclaimed DIY fund disrupter is on the scene, Motif Investing of San Mateo, Calif.

FORBES: Magazine Article