### 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, <v>bitcoin</v> ushered in several milestones in 2021.
### Errors: There is a minor fluency/spelling error at "bitcoin" within <v></v>.

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