但是，像现金一样，比特币可通过定位存储它们的电脑而被追踪到。

But, like cash, Bitcoins can be nabbed by seizing the computer on which they are stored.

一些人为“开采”比特币汇集了数百台计算机，而大多数人只是通过兑换的方式购买。

Some people have pooled together hundreds of machines to “mine” Bitcoins. Most folks, however, just buy them on an exchange.

不久前，一比特币价格不到一美元，但在近几个月中，它的价格上升到8美元，然后到20美元，然后超过30美元，后来又回落到18美元这个当前价位。

Not long ago a single Bitcoin sold for less than a dollar, but in recent months the price climbed to $8, then to $20, then above $30, before falling back to $18, the current level.

If you go to Denmark and you break a $100 bill, you're going to be given one of these, undoubtedly, the 500 kroner note, which is worth about $75-80, and it has Niels Bohr on it.

如果你去了丹麦，换了100美元，毫无疑问，你会得到其中一个像这样的，500挪威币，约为75-80美元，上面有波尔的头像。

And through this way behaviorists have developed token economies where they get nonhuman animals to do interesting things for seemingly arbitrary rewards like poker chips.

通过这种方式,行为主义者们发明了代币法,他们用一种特定的类似于扑克筹码的奖励,来训练非人类动物。

So for instance, institutions like mental institutions and some prisons have installed token economies where there's rewards for good behavior, often poker chips of a sort.

比如像精神病院和监狱这样的机构,都引入了代币法,来奖励良好行为，这些代币通常是扑克筹码一类的东西。