比特币只存在于互联网上，而且储存在虚拟钱包里。
Bitcoins exist only online and are stored in virtual wallets.
比特币仅仅存在于网络且存储于虚拟钱包。
Bitcoins exist only online and are stored in virtual wallets.
通过在线交易，用户将现金兑换为虚拟货币，并将其储存在“电子钱包”中。
Users swap cash for virtual currency using online exchanges, then store it in a wallet program on their computer.
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