### Chinese: 诞生12年，比特币在2021年迎来了几个里程碑事件。
### English: Twelve years after its birth, Bitcoin met several milestones events in 2021.
### Errors: There is a minor error at "birth". There is a minor error at "met". There is a minor error at "tones events".

### Improved English: After coming into being 12 years ago, bitcoins ushered in several milestone events in 2021.