A number of street artists around the world have started expressing themselves through a practice known as reverse graffiti.

世界各地的一些街头艺术家已经开始通过做一种被称为反向涂鸦的实践，来表达自己的想法。

And you're like amazed because you're seeing this incredible graffiti.

你很惊讶，因为你看到了这些令人难以置信的涂鸦。

Here goes some more paintbrushes for you, taking the graffiti off them buildings.

这里有更多的画笔给你，把建筑物上的涂鸦去掉。

Now there is graffiti everywhere, even here in the school sometimes!

现在到处都是涂鸦，有时甚至在学校！

Some tourists write graffiti on prison walls at S-21 in Phnom Penh.

一些游客在金边 S-21 监狱的墙上涂鸦。

Nowadays, there are four general sorts of graffitigang graffiti, socio-political graffiti, expressive or humorous graffiti, and public art.

如今，街头涂鸦大致可分为四大类：帮派涂鸦、社会政治涂鸦、富有表现力或幽默的涂鸦以及公共艺术。

A third characteristic of hip hop culture is graffiti writing.

嘻哈文化的第三个特征是涂鸦。

The walls of Pompeii are covered in graffiti  – and it's not from thoughtless tourists.

4. 庞贝古城的墙壁上满是涂鸦——这可不是漫不经心的游客所为。

But in  Italian graffiti are plural acts of vandalism - or art - depending on your view.

但在意大利，涂鸦是多种形式的破坏行为 - 或艺术 - 取决于你的观点。

So our goals for this little graffiti are no kissing, no overlaying lines, and we want to be very observant.

所以我们对这个小涂鸦的目标是没有接吻，没有重叠的线条， 而且我们希望非常细心。