But where do bitcoins actually come from?

但这些比特币从哪儿来呢？

Bitcoins exist only online and are stored in virtual wallets.

比特币只存在于互联网上，而且储存在虚拟钱包里。

Some say Bitcoins are being used to buy illegal drugs online via shadowy markets that exploit both the effectively untraceable Bitcoins and the anonymous way they can be traded.

有些人说比特币被用来从地下市场在线购买非法毒品，这种地下市场既利用了比特币的难追踪性，又利用了交易的匿名性。

The rate at which Bitcoins are minted is designed to mimic the extraction of minerals.

比特币的铸造速度模拟了矿产开发。

Critics point out that Bitcoins suffer the same flaws as other metal-based currencies with finite supply.

批评者指出，比特币与其他基于金属的货币一样有存在供给极限的缺陷。

You can go download the software right now and run it in your computer and try to collect some bitcoins.

你现在就可以从网上下载这个程序，你现在就可以从网上下载这个程序。

In the case of Bitcoins, some think that decreasing the rate of money creation over time will entail deflation.

一些人认为，在比特币的世界中，货币创造速度逐渐减缓会造成通缩。

This absence of a central monetary authority to control the money supply is what many find exciting about Bitcoins.

没有中央货币当局控制货币供给正是许多人对比特币感到欢欣鼓舞的原因。

In March, there was a transaction that moved around 100,000 bitcoins. That's the equivalent of 40 million US dollars.

今年三月份，有一笔交易高达10万比特币。这相当于4千万美元。

For the purposes of taxation, meanwhile, reimbursing somebody for a product or service in BitCoins is treated as barter.

同时出于税收的目地，用比特币来偿还某人的产品或者服务也按照等价交换对待。