2020年5月12日，比特币完成了第三次减半，区块奖励从12.5个BTC下降到6.25个BTC。
On 12 May 2020, Bitcoin completed its third reduction by half, with block incentives down from 12.5 BTC to 6.25 BTC.
BTC交易由“矿商”验证。每隔10分钟就会有一个比特币交易被验证，然后被添加到比特币区块链中。这是一项复杂的数学工作，它需要昂贵的硬件和强大的计算能力。这种设备也需要大量的电力，这使得采矿成为一项非常昂贵的活动。
BTC transactions are certified by a “miner” every 10 minutes. A bitcoin transaction is certified and then added to the bitcoin block chain. This is a complex mathematical exercise that requires expensive hardware and a strong computing capability. This equipment also requires large amounts of electricity, making mining a very expensive activity.
每10分钟，这些新比特币就会被奖励给矿工，也就是所谓的“区块奖励”。这就是“减半”的意义所在：每开采21万个区块，开采BTC的回报就会减半。所以它从50个BTC上升到25个BTC，又上升到12.5个BTC。
Every 10 minutes, these new bitcoins are rewarded to miners, the so-called block incentives. That's what's meant by "50%": for every 210,000 blocks, the return on BTC is halved. So it rose from 50 BTCs to 25 BTCs, and to 12.5 BTCs.
比特币的历史已经经历了两次下跌，在这两次下跌中，比特币的价格都出现了长期增长，在12至18个月后达到峰值。
The history of Bitcoin has experienced two drops, both of which saw long-term increases in Bitcoin prices, peaking 12 to 18 months later.
第一次减半发生在2012年11月。当时，BTC只值大约11美元。但在2013年，比特币的价格开始飙升，达到了1100多美元的历史新高。这是9900%的增长。
The first half occurred in November 2012, when BTC was worth only about $11. But in 2013, Bitcoin prices began to soar, reaching an all-time high of more than $1,100. This is an increase of 9,900 per cent.
第二次BTC减半发生在2016年7月。BTC连续几个月升至580- 700美元区间，并在年底前缓慢上升。BTC在12月创下了大约2万美元的历史新高，比17个月前的220美元上涨了891%。在这两种情况下，在价格减半后的12至18个月出现了大幅增长，随后出现了回调，价格远低于历史最高水平，但仍远高于此前水平。
The second half of the BTC took place in July 2016. BTC rose for several months in a row to $580-7000 and rose slowly by the end of the year. BTC reached an all-time high of about $20,000 in December, up 891% from $220 17 months ago. In both cases, there was a significant increase between 12 and 18 months after the price was halved, followed by a rebound, with prices well below historical levels, but still well above previous levels.
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