Welcome to the Voice of America's News Words.
欢迎收看美国之音：新闻词汇。
The digital money bitcoin is traded online with a new accounting system. Blockchain.
数字货币比特币通过一个新的会计系统进行在线交易。区块链。
The concern with digital money like bitcoin is that, like everything else on the internet,
对于像比特币这样的数字货币，人们担心它像互联网上的其他事情一样，
people fear it can be hacked and stolen.
会被黑客攻击和被盗。
But supporters say that is not possible with blockchain technology.
但是支持者表示，在区块链技术下这是不可能的。

A blockchain is a record of all the users' transactions.
一个区块链是所有用户交易的一个记录。
Each completed transaction is called a "block".
每个完整的交易都叫做一个“块”。
It is linked to the previous blocks and saved.
它链接到前面的块并被保存。
Together, the blocks form a blockchain that all users can see and that cannot be changed.
链接到一块，这些块形成了一个区块链，所有用户都能看到并且不能被改变。